Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
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| pineal melatonin secretion, but not ocular melatonin secretion, is sufficient to maintain normal immune responses in japanese quail (coturnix coturnix japonica). | reports that plasma melatonin is an important immune regulator in avian species have been rather sparse and contradictory. also, the primary source of immune-modulating melatonin has yet to be determined in birds. in japanese quail (coturnix coturnix japonica), the pineal gland and eyes contribute roughly two thirds and one third of the melatonin found in the blood, respectively. two experiments were conducted to evaluate melatonin as an immune modulator in japanese quail and to determine the pr ... | 2002 | 12093123 |
| [the effect of argon-containing hypoxic gas environment on development of japanese quail embryos]. | in case of acute hypoxic hypoxia argon in the gas environment is favorable to survivability of laboratory animals (rats). our purpose was to evaluate effects of an argon-containing hypoxic gas environment on embryogenesis of the japanese quail (cortunix cortunix japonica). eggs of the japanese quail were incubated in a pressurized chamber with a hypoxic gas environment differing in concentration of nitrogen and argon. in hypoxic (10% o2) oxygen-nitrogen and oxygen-nitrogen-argon atmospheres tota ... | 2002 | 12098947 |
| [morphological study of gastrocnemius muscle in japanese quail chicks hatched out in space flight]. | slovak experiment quail sk-6 aboard orbital station mir in the period of february 20-27, 1999 resulted in hatching out of viable chicks of the japanese quail. the paper presents morphologic results of investigation of m. gastrocnemius of the chicks after 4-5-d life in space microgravity. on the whole, histologically the gastrocnemius of the space chicks was very much similar to that of the control group. muscular fibers were, which is typical, striated; bundles of myofibrills and numerous nuclei ... | 2002 | 12098956 |
| steroid modulation of muscarinic cholinergic and alpha2-adrenergic receptor density in the nucleus intercollicularis of the japanese quail. | androgen modulation of neurotransmitter receptor density was investigated in the nucleus intercollicularis (ico) of male and female japanese quail (coturnix coturnix japonica). ico appears to play an important role in the neural control of testosterone (t) dependent vocal behaviour. two receptor types were investigated in this nucleus; muscarinic cholinergic receptors, labelled using [3h]n-methyl scopolamine (nms) as the ligand, and alpha2-adrenergic receptors, labelled using [3h]p-amino-clonidi ... | 1990 | 12106090 |
| development of embryos from in vitro ovulated and fertilized oocytes of the quail (coturnix coturnix japonica). | the development of quail embryos obtained after in vitro fertilization of oocytes ovulated in vitro was investigated. about 40% of the specimens, after 18-20 hr of incubation, had undergone cleavage to reach stages iv-vi when viewed under a stereo microscope. however, only 36% of these embryos contained normal, dapi-stained nuclei when observed under a fluorescent microscope; the other 64% showing a morphologically normal cleavage pattern did not contain nuclei. control unfertilized oocytes, ovu ... | 2002 | 12115941 |
| effects of starvation on gonadotropin and thyrotropin subunit mrna levels and plasma hormone levels in the male japanese quail (coturnix coturnix japonica). | contents of mrnas encoding lhbeta-, fshbeta-, tshbeta- and common a-subunit precursor molecules were measured in male japanese quail deprived of food for three days. plasma lh, fsh, thyroxine and triiodothyronine levels were also measured in the same birds. plasma lh levels declined during the period of food deprivation. levels in starved birds were not different from those in control birds after one day of starvation but were significantly lower after three days. plasma fsh levels showed a simi ... | 2002 | 12125931 |
| expression of s-100 protein in intercalated duct cells of bovine pancreas. | although mutoh et al. have found intercalated ducts in the pancreatic islets of avians, including the chicken, moorhen (gallinula chloorpus), and japanese quail (coturnix coturnix japonica), and even demonstrated the functions of intercalated duct cells in pancreatic islets, to our knowledge, there have been only a few reports on the relationship between intercalated ducts and islets in mammalia. accordingly, in this study, we investigated whether intercalated ducts are morphologically related t ... | 2002 | 12126053 |
| effects of starvation and refeeding on gonadotropin and thyrotropin subunit mrnas in male japanese quail. | the contents of mrnas encoding lh beta-, fsh beta-, tsh beta- and common alpha-subunit precursor molecules were measured in food-deprived and subsequently re-fed male japanese quail. pituitary lh beta, fsh beta and common alpha mrna levels were decreased by starvation, and increased to the control levels by re-feeding. the rates of decreases of lh beta and common alpha mrna levels were greater the corresponding rate for fsh beta levels. pituitary tsh beta mrna levels were not decreased by starva ... | 2002 | 12130823 |
| visual memory of shapes in quail chicks: discrimination among 2-dimensional objects. | newly hatched chicks spontaneously peck at conspicuous objects, and soon learn to discriminate between edible food particles and inedible objects. to examine whether this discrimination is based on a chick's ability to memorize objects by shape cues, we analyzed the pecking behavior. one- to 3-day old quail chicks (coturnix japonica) were presented with dry objects of different shapes (ball, disk, triangle and t-shape) of similar size (4 mm) and color (green). habituation occurred after repeated ... | 2002 | 12149571 |
| selection of japanese quail for reduced adrenocortical responsiveness accelerates puberty in males. | differences in the onset of puberty were assessed in male japanese quail from a random-bred (rb, control) line and two lines that had been genetically selected for reduced (low stress, ls) or exaggerated (high stress, hs) plasma corticosterone response to brief mechanical restraint. at 42 d of age, cloacal gland area (carea) and volume (cvol), proportion of individuals that produced cloacal gland foam (picf), and intensity of cloacal gland foam production (cfp) were examined in 60 representative ... | 2002 | 12162347 |
| production and characterization of a turkey sperm mitochondrial monoclonal antibody and its usefulness for assessment of sperm integrity. | a monoclonal antibody (4c7/2e4) that binds to an antigen located on the midpiece of turkey spermatozoa has been produced and characterized. the antibody was also reactive to antigens on the midpiece of chicken, japanese quail, and bobwhite quail spermatozoa but was unreactive to spermatozoa from guinea fowl, human, horse, boar, and bull. immunogold transmission electron microscopy of turkey spermatozoa showed that the antibody was associated with the outer mitochondrial membrane. titratable anti ... | 2002 | 12162348 |
| effect of low levels of dietary aflatoxin b1 on laying japanese quail. | in the present study, 256 7-wk-old japanese quail were randomly distributed into four experimental groups (64 birds per group) and given rations containing 0 (controls), 25, 50, or 100 (g aflatoxin b, (afb1)/kg feed for 168 d. each treatment consisted of four replicates of 16 quail. egg production and individual egg weight were checked daily. feed consumption and feed use were determined weekly. eggs laid in the last day of each 28-d laying period were collected and subjected to individual analy ... | 2002 | 12162358 |
| t-maze behavior and early egg production in japanese quail selected for contrasting adrenocortical responsiveness. | broiler chicks that traverse a t-maze quickly to reinstate contact with their companions (hp, high performance) are known to grow faster, be more social, and exhibit a reduced plasma corticosterone (b) response to acute stress than slower (lp, low performance) chicks. genetic lines of japanese quail selected for reduced (ls, low stress) or exaggerated (hs, high stress) plasma b response to brief restraint also differ in sociality and performance. in the present study, we asked if divergence in e ... | 2002 | 12162359 |
| effects of hemicastration and castration on foam production and its relationship with fertility in male japanese quail. | healthy heavy body weight strain of adult male japanese quail (coturnix coturnix japonica) of the same age were used in this study to observe the effect of hemicastration and castration on the frequency of foam discharges from cloacal gland and other related parameters. the quails were housed in individual cages and divided into four groups: control (intact birds), sham-operated control (intact birds with incision), hemicastrated, and castrated groups of birds. hemicastration and castration were ... | 2002 | 12182362 |
| solution structure of ascidian trypsin inhibitor determined by nuclear magnetic resonance spectroscopy. | the three-dimensional solution structure of ascidian trypsin inhibitor (ati), a 55 amino acid residue protein with four disulfide bridges, was determined by means of two-dimensional nuclear magnetic resonance (2d nmr) spectroscopy. the resulting structure of ati was characterized by an alpha-helical conformation in residues 35-42 and a three-stranded antiparallel beta-sheet in residues 22-26, 29-32, and 48-50. the presence of an alpha-helical conformation was predicted from the consensus sequenc ... | 2002 | 12186551 |
| evidence for species differences in the pattern of androgen receptor distribution in relation to species differences in an androgen-dependent behavior. | chickens (gallus gallus domesticus) and japanese quail (coturnix japonica), two closely related gallinaceous bird species, exhibit a form of vocalization-crowing-which differs between the species in two components: its temporal acoustic pattern and its accompanying postural motor pattern. previous work utilizing the quail-chick chimera technique demonstrated that the species-specific characteristics of the two crow components are determined by distinct brain structures: the midbrain confers the ... | 2002 | 12210104 |
| effects of lesions of nucleus taeniae on appetitive and consummatory aspects of male sexual behavior in japanese quail. | neurochemical, hodological and functional criteria suggest that the nucleus taeniae and parts of the adjacent archistriatum represent the avian homologue of parts of the mammalian amygdaloid complex. it has been proposed in particular that the nucleus taeniae is the homologue of the mammalian medial amygdala. in male quail, relatively large lesions to the posterior/medial archistriatum selectively decrease the expression of appetitive sexual behavior in a manner reminiscent of similar manipulati ... | 2002 | 12239468 |
| ultraviolet colour perception in european starlings and japanese quail. | whereas humans have three types of cone photoreceptor, birds have four types of single cones and, unlike humans, are sensitive to ultraviolet light (uv, 320-400 nm). most birds are thought to have either a violet-sensitive single cone that has some sensitivity to uv wavelengths (for example, many non-passerine species) or a single cone that has maximum sensitivity to uv (for example, oscine passerine species). uv sensitivity is possible because, unlike humans, avian ocular media do not absorb uv ... | 2002 | 12324539 |
| effects of exogenous testosterone on testicular luteinizing hormone and follicle-stimulating hormone receptors during aging. | during aging, the male japanese quail exhibits a loss of fertility, increased morphological abnormalities in the testes, and a higher incidence of sertoli cell tumors. although there is a coincident loss of reproductive behavior, plasma androgen levels remain high until testicular regression occurs in association with senescence. the purpose of this study was to compare mean specific binding of chicken luteinizing hormone (lh) and follicle-stimulating hormone (fsh) as a measure of testicular rec ... | 2002 | 12324665 |
| social influences on food choices of norway rats and mate choices of japanese quail. | 2002 | 12354687 | |
| toxicity of dietary heliotropium dolosum seed to japanese quail. | five groups of 30 male japanese quail, each 7-w-old, were fed diets containing 0, 1, 3, 5, or 10% (w/w) of dehulled h dolosum seed. half of the birds from the each group were killed at 6 and 24 w after beginning of the trial. at the end of 6th w, neither mortality nor clinical sign occurred in test groups. in the 5 and 10% inclusion levels, mild to moderate hepatic injury was detected as evidenced by mild karyomegaly, moderate fatty change, focal or portal fibrosis, bile duct hyperplasie, and ov ... | 2002 | 12361106 |
| heterosis in body weight related to growth performance of parental lines of japanese quail and to heterosis in lay. | 1. three outbred lines of japanese quail and their reciprocal crosses were used. the lines differed in mature body weight or in the shape of the growth curve. growth was described by body weight (bw) at 0, 4, 7, 14, 21, 28, 35, 42, 48, 56, 63 and 70 d of age and expressed by the parameters of richards' function. dickerson's model was used to estimate direct genetic, maternal genetic and direct heterotic effects. 2. the magnitude of bw heterosis was not constant during postnatal growth, it showed ... | 2002 | 12365507 |
| bone microstructure and developmental plasticity in birds and other dinosaurs. | patterns of bone microstructure have frequently been used to deduce dynamics and processes of growth in extant and fossil tetrapods. often, the various types of primary bone tissue have been associated with different bone deposition rates and more recently such deductions have extended to patterns observed in dinosaur bone microstructure. these previous studies are challenged by the findings of the current research, which integrates an experimental neontological approach and a paleontological co ... | 2002 | 12386894 |
| ocular clocks are tightly coupled and act as pacemakers in the circadian system of japanese quail. | our previous studies showed that the eyes of japanese quail contain a biological clock that drives a daily rhythm of melatonin synthesis. furthermore, we hypothesized that these ocular clocks are pacemakers because eye removal abolishes freerunning rhythms in constant darkness (dd). if the eyes are indeed acting as pacemakers, we predicted that the two ocular pacemakers in an individual bird must remain in phase in dd and, furthermore, the two ocular pacemakers would rapidly regain coupling afte ... | 2003 | 12388441 |
| id2 expression during apoptosis and satellite cell activation in unloaded and loaded quail skeletal muscles. | inhibitor of differentiation-2 (id2) is a basic helix-loop-helix protein that acts as a negative regulator of the myogenic regulatory transcription factor family, but id2 has also been implicated in apoptosis in several cell lines. in this study, we tested the hypothesis that id2 has a role in both apoptosis-associated muscle atrophy and muscle hypertrophy. a weight corresponding to 12% of the body weight was attached to one wing of japanese quail to induce hypertrophy in the patagialis (pat) mu ... | 2003 | 12388448 |
| imitative learning in japanese quail (coturnix japonica) using the bidirectional control procedure. | in the bidirectional control procedure, observers are exposed to a conspecific demonstrator responding to a manipulandum in one of two directions (e.g., left vs. right). this procedure controls for socially mediated effects (the mere presence of a conspecific) and stimulus enhancement (attention drawn to a manipulandum by its movement), and it has the added advantage of being symmetrical (the two different responses are similar in topography). imitative learning is demonstrated when the observer ... | 2002 | 12391793 |
| [lampbrush chromosomes in the japanese quail coturnix coturnix japonica: cytological maps of macro chromosomes and meiotic crossover frequency in females]. | cytological maps of lampbrush macrobivalents of the japanese quail (coturnix coturnix japonica) were constructed. investigation of chiasmata allowed determination of the meiotic frequency of reciprocal genetic recombination (crossing over) in japanese quail females. the total chiasma number in bivalents of japanese quail oocyte nuclei was determined to be 53-58. macrobivalents 1-5 and z of the japanese quail had on average 3.3 chiasmata per bivalent, and microbivalents, 1.0-1.1 chiasmata per biv ... | 2002 | 12391886 |
| occurrence of conjunctivitis, sinusitis and upper region tracheitis in japanese quail (coturnix coturnix japonica), possibly caused by mycoplasma gallisepticum accompanied by cryptosporidium sp. infection. | on a farm raising approximately 75,000 japanese quail (coturnix coturnix japonica) for egg production, the diseased quail showed clinical signs of swelling of the head, nasal discharge, increased lacrimation, and decreased egg production. the flock experienced a mortality rate of 5.7% per day. macroscopic observation revealed large, gelatinous masses of caseous exudate in the sinuses, egg peritonitis, and airsacculitis. microscopically, non-purulent or purulent inflammation accompanied by lympho ... | 2002 | 12396337 |
| the photoperiodic entrainment and induction of the circadian clock regulating seasonal responses in the migratory blackheaded bunting (emberiza melanocephala). | the properties of the circadian photoperiodic oscillator have been investigated in detail only in the japanese quail. while the study of the quail is clearly very important, one cannot simply assume that other species, especially passerines that seem to have a different circadian organization than quail, function the same way. the current set of experiments was conducted to understand the entrainment and photoinduction of the circadian photoperiodic oscillator in a passerine species, the blackhe ... | 2002 | 12405550 |
| effect of melatonin administration on qper2, qper3, and qclock gene expression in the suprachiasmatic nucleus of japanese quail. | temporal changes of mrna expression of three clock genes, qper2, qper3 and qclock, were studied in the suprachiasmatic nucleus (scn) of japanese quail under different light conditions, as well as under the condition of continuous melatonin. in addition, the expression of melatonin receptor genes, mel1a and mel1c, in the scn were also examined. the expression of qper2 mrna showed robust oscillation during both light and dark (ld) 12:12 cycles and under constant dark conditions (dd), but did not e ... | 2002 | 12405968 |
| localization of oestrogen receptors in the sensory and motor areas of the spinal cord in japanese quail (coturnix japonica). | in japanese quail, the presence of aromatase (oestrogen synthase) in the dorsal horn of the spinal cord suggests that spinal sensory processes might be controlled by local actions of oestrogens. this is supported by the presence of oestrogen receptors and aromatase in the dorsal horn of the spinal cord in rats, and by the alteration of sensitivity by oestrogens in various mammalian species and also in canaries. we investigated whether oestrogens that are locally produced in the quail spinal cord ... | 2002 | 12421343 |
| validation of the dlw method in japanese quail at different water fluxes using laser and irms. | in japanese quail (coturnix c. japonica; n = 9), the doubly labeled water (dlw) method ((2)h, (18)o) for estimation of co(2) production (l/day) was validated. to evaluate its sensitivity to water efflux levels (r(h(2))o(e); g/day) and to assumptions of fractional evaporative water loss (x; dimensionless), animals were repeatedly fed a dry pellet diet (average r(h(2))o(e) of 34.8 g/day) or a wet mash diet (95.8 g/day). we simultaneously compared the novel infrared laser spectrometry (ls) with iso ... | 2002 | 12433938 |
| melatonin can produce immunoenhancement in japanese quail (coturnix coturnix japonica) without prior immunosuppression. | in recent years, it has been determined that melatonin has important immunostimulatory properties in mammalian and avian species. typically, this immunoenhancement has only been examined in immunosuppressed animals. the effect of melatonin on normal (unsuppressed) immune systems is yet to be evaluated in avian species. an experiment was performed to determine if transient and/or continuous melatonin treatments could enhance immune functions in japanese quail without prior immunosuppression. all ... | 2002 | 12441122 |
| vitamin e supplementation can alleviate negative effects of heat stress on egg production, egg quality, digestibility of nutrients and egg yolk mineral concentrations of japanese quails. | the aim of this study was to determine if the negative effects of high ambient temperature (34 degrees c) on egg production, egg quality, digestibility of nutrients, and mineral content of egg yolk could be alleviated by dietary vitamin e (dl-alpha-tocopheryl acetate) supplementation in laying japanese quails (coturnix coturnix japanica). japanese quails (n=240; 7-week-old) were divided into eight groups, 30 birds per group. the quails were fed either a basal diet or the basal diet supplemented ... | 2002 | 12443690 |
| plaque assay for avian metapneumovirus using a japanese quail fibrosarcoma cell line (qt-35). | a plaque assay for detecting, isolating and titrating avian pneumoviruses using a japanese quail fibrosarcoma cell line (qt-35) is described. plaques are produced after application of either an agarose or carboxymethyl-cellulose (cmc) overlay onto cell monolayers infected with representative avian metapneumoviruses which belong to subgroup a, b or c. virus plaques can be easily visualized by light microscopy or after staining. the parameters affecting plaque appearance include: cell seeding conc ... | 2003 | 12445932 |
| establishment of inbred strains of chicken and japanese quail and their potential as animal models. | we started establishing inbred strains of chicken and japanese quail in 1970. in class aves, full sib mating is highly difficult due to inbreeding depression. in the chicken, we attempted to establish some inbred strains in three breeds, black minorca, white leghorn and fayoumi by fixing all the characters that differentiate individuals homozygously. in this paper, we describe some marker genes and characters fixed in the inbred strains of chicken and japanese quail as well as a calculation of a ... | 2002 | 12451702 |
| analysis of censored survival data in japanese quail divergently selected for growth and their control. | the aim of the current study was to characterize and quantify risk factors involved in juvenile mortality in divergently selected and control lines of japanese quail. survival analysis and cox proportional hazards regression were used to describe mortality in the three experimental lines with hatch weight and posthatch bw evaluated as risk factors. survival function distribution indicated that the proportional mortality was highest in the line selected for high 4-wk bw compared to the low and co ... | 2002 | 12455585 |
| steroid receptor coactivator src-1 exhibits high expression in steroid-sensitive brain areas regulating reproductive behaviors in the quail brain. | the steroid receptor coactivator src-1 modulates ligand-dependent transactivation of several nuclear receptors, including the receptors for sex steroid hormones. reducing the expression of src-1 by injection of specific antisense oligonucleotides markedly inhibits the effects of estrogens of the sexual differentiation of brain and behavior in rats and inhibits the activation of female sexual behavior in adult female rats. src-1 thus appears to be involved in both the development and activation o ... | 2002 | 12457041 |
| long term dietary supplementation with zeaxanthin reduces photoreceptor death in light-damaged japanese quail. | the purpose of these studies was to evaluate the effects of light damage on japanese quail whose retinal carotenoids had been experimentally manipulated through altered diets. the birds were raised 6 months on a commercial turkey diet (t), on a custom carotenoid-deficient diet (c-) containing 90% less carotenoid than the t diet, or on z+ diet [the c- diet supplemented with natural zeaxanthin (35mgkg(-1) food)]. equal numbers of males and females on each diet were exposed to nine intervals (1hr o ... | 2002 | 12457865 |
| persistence of pregnant mare serum gonadotrophin in plasma of japanese quail (coturnix coturnix japonica). | pregnant mare serum gonadotrophin (pmsg) is currently being used to develop a hormone regime that will stimulate reproductive development in japanese quail (coturnix coturnix japonica). in this study, the persistence of pmsg in quail plasma was examined after a single injection of the hormone (500 iu). plasma concentrations of pmsg increased to a peak 12 h after injection and declined to approximately 50% of peak concentrations 24 h after injection. pregnant mare serum gonadotrophin concentratio ... | 2002 | 12467352 |
| content of retinol and retinyl esters in blood plasma, liver, kidney and reproductive organs of japanese quails. | due to its importance in many physiological processes such as cell proliferation and differentiation, vitamin a plays a key role in reproduction. the present study examines the content and distribution of retinol and retinyl esters in the blood plasma, liver, kidney, ovary and oviduct (infundibulum, magnum, isthmus and uterus) of the laying japanese quail. (1) the results show that the stage of egg laying had no influence on the level of vitamin a (retinol or retinyl esters) in plasma, kidney an ... | 2002 | 12498148 |
| circadian rhythms of oviposition and feeding activity in japanese quail: effects of cyclic administration of melatonin. | the aim of these experiments was to test the effect of a cyclic administration of melatonin, by mimicking the daily rhythm of hormone levels, on the circadian organization of two distinct functions in quail: oviposition and feeding activity. laying and feeding rhythms under photoperiodic conditions and constant darkness (dd) were investigated. under dd, where the two rhythms were free running, a daily rhythm of melatonin was administered. in ld 14 h:10 h, two different individual profiles of lay ... | 2002 | 12511029 |
| retinoid metabolism (lrat, reh) in the yolk-sac membrane of japanese quail eggs and effects of mono-ortho-pcbs. | retinoids stored in the avian egg are essential for normal development, however, laboratory and field experiments suggest that they are affected by environmental contaminants. lecithin:retinol acyltransferase (lrat) activity was detected in the microsomal fraction of the yolk-sac membrane of the japanese quail at day 6 of development. lrat activity was maximal at ph 7.0 having apparent kinetic parameters of k(m)=1.35 microm and v(max)=0.21 nmol/mg protein/h and was inhibited by the sulfhydryl mo ... | 2003 | 12524014 |
| cytochrome p450 enzyme activity in five herbivorous, non-passerine bird species. | we examined hepatic cytochrome p450 activity in wild and hand-reared grey partridges (perdix perdix), capercaillies (tetrao urogallus) and ring-necked pheasants (phasianus colchicus), as well as the enzyme activity in a variety of tissues of hand-reared japanese quails (coturnix coturnix japonica) and pigeons (columba livia). post-mortem decrease in hepatic enzyme activity in the grey partridge was measured. hepatic 7-ethoxyresorufin-o-deethylase activity was similar in wild and hand-reared grey ... | 2003 | 12524019 |
| hypothalamic indolamines during embryonic development and effects of steroid exposure. | the serotonin system has been implicated in the modulation of endocrine and behavioral components of reproduction. in this study, we examined endogenous hypothalamic indolamines during sexual differentiation and long-term effects of exogenous steroids during this time. in experiment 1, japanese quail were studied during the last half of embryonic development and early post-hatch. samples were taken at embryonic day 10 (e10), e12, e14, e16, hatch (day 0), and days 3 and 5, post-hatch. hypothalami ... | 2003 | 12535620 |
| factorial correspondence analysis of fear-related behaviour traits in japanese quail. | factorial correspondence analysis was performed on 341 quails from a f2 cross between two lines divergently selected on the duration of tonic immobility over 29 generations. several fear- or stress-related traits were recorded, i.e. tonic immobility duration, number of inductions needed to induce tonic immobility, open-field behaviour (time spent walking, latency before first movement and number of defecations), asymmetry of tibia lengths and corticosterone concentration after restraint stress. ... | 2003 | 12543484 |
| [morphological changes in the adrenal gland of japanese quail chicken hatched out in microgravity]. | the paper presents results of studying effects of spaceflight factors on the adrenal structure in japanese quail hatchlings (coturnix coturnix japonica) incubated and kept alive 4 to 5 days aboard the space station mir. in comparison with the ground controls, cortical cells in the adrenals of space hatchlings contained copious fat drops, mitochondrias, and significantly dilated cisterns of the endoplasmic reticulum. accumulation of fat drops evidences lowered cholesterol transformation and distu ... | 2002 | 12572121 |
| anatomical relationships between aromatase-immunoreactive neurons and nitric oxide synthase as evidenced by nos immunohistochemistry or nadph diaphorase histochemistry in the quail forebrain. | in japanese quail (coturnix japonica), previous studies indicated that the distribution of reduced nicotinamide dinucleotide phosphate (nadph) diaphorase overlaps with steroid-sensitive areas that contain dense populations of aromatase-immunoreactive (aro-ir) cells. we investigated here the anatomical relationships between aromatase (aro) and nitric oxide synthase (nos)-containing cells that were visualized both by nos-immunohistochemistry and nadph-histochemistry. the distribution of aro-ir and ... | 2003 | 12573458 |
| deuterium-free water (1h2o) in complex life-support systems of long-term space missions. | heavy water containing deuterium displays toxic property. it is stated that any quantity of a heavy isotope of hydrogen--deuterium--is undesirable to animals and plants. it was earlier shown by us that physical-chemical life support systems on board the "mir" station fractionate (change) isotopes of hydrogen, oxygen and carbon. therefore, the problem of regenerative systems in habitable space objects should include removal, from water, of a heavy stable isotope of hydrogen--deuterium. in this ar ... | 2003 | 12575722 |
| genetic characterization of stress responsiveness in japanese quail. 1. analyses of line effects and combining abilities by diallel crosses. | the inheritance of stress responsiveness (line effects and combining abilities) was phenotypically studied in progeny from diallel crosses of randombred (rb) quail and quail selected for exaggerated (high stress, hs) or reduced (low stress, ls) plasma corticosterone (cs) response to brief immobilization. the three genotypes were crossed in a 3 x 3 factorial arrangement of treatments that allowed all possible crosses between rb, ls, and hs males with rb, ls, and hs females. the nine crosses produ ... | 2003 | 12580240 |
| genetic characterization of stress responsiveness in japanese quail. 2. analyses of maternal effects, additive sex linkage effects, heterosis, and heritability by diallel crosses. | diallel crosses were used to investigate the genetic inheritance of stress responsiveness through examination of population effects in progeny of randombred (rb) quail and quail selected for reduced (low stress, ls) or exaggerated (high stress, hs) plasma corticosterone (cs) response to brief immobilization. the three genotypes were crossed in a 3 x 3 factorial arrangement of treatments that allowed all possible crosses between rb, ls, and hs males with rb, ls, and hs females. the nine crosses p ... | 2003 | 12580241 |
| reproductive impairment in japanese quail (coturnix japonica) after in ovo exposure to o,p'-ddt. | we have previously described various effects in adult japanese quail consequent on treatment with oestrogenic compounds in ovo. in the present study, the environmental contaminant o,p'-ddt [1-(2-chlorophenyl)-1-(4-chlorophenyl)-2,2,2-trichloroethane] was administered to quail eggs to further evaluate test endpoints for oestrogenic effects related to reproduction in the japanese quail. exposure to 2 mg o,p'-ddt/egg (150 micro g/g egg) resulted in impaired sexual behaviour, reduced cloacal gland a ... | 2003 | 12590364 |
| asparagine-linked oligosaccharide-independent secretion of egg envelope glycoprotein zpc of the japanese quail (coturnix japonica). | in avian species, a glycoprotein homologous to mammalian zpc is synthesized in the granulosa cells of developing follicles. we have previously reported that the newly synthesized zpc (prozpc) in the granulosa cells is cleaved at the consensus furin cleavage site to generate mature zpc prior to secretion. in the present study, we examined the role of asparagine (n)-linked oligosaccharides in the proteolytic processing of prozpc and the subsequent secretion of zpc by using site-directed mutagenesi ... | 2003 | 12600672 |
| effect of selection for growth on onset of sexual maturity in randombred and growth-selected lines of japanese quail. | an experiment was conducted to determine the effect of selection for growth (bw) on the onset of reproduction (first egg) in japanese quail hens from growth-selected (hw) and randombred (r1) lines. the hw line had undergone over 40 generations of selection for increased 4-wk bw and was originally developed from the r1 line. data were collected over two consecutive hatches and summarized by hatch and within lines. body weight at 35 d of age was positively correlated with bw at sexual maturity (fi ... | 2003 | 12619793 |
| identification of cgnrh-ii in the median eminence of japanese quail (coturnix coturnix japonica). | in a previous paper, we described the presence of cgnrh-ii in the quail (coturnix coturnix japonica) and chicken (gallus gallus) median eminence using highly specific antibodies directed against a polypeptide corresponding to the c-terminal portion of cgnrh-ii (van gils et al., 1993). this finding remained very controversial, since no other study, with any other antibody, had ever reported the presence of cgnrh-ii immunoreactive fibers in the median eminence of birds. in this study, the cgnrh-ii ... | 2003 | 12620246 |
| complete nucleotide sequence of the coturnix chinensis (blue-breasted quail) mitochondrial genome and a phylogenetic analysis with related species. | coturnix chinensis (blue-breasted quail) has been classically grouped in galliformes phasianidae coturnix, based on morphologic features and biochemical evidence. since the blue-breasted quail has the smallest body size among the species of galliformes, in addition to a short generation time and an excellent reproductive performance, it is a possible model fowl for breeding and physiological studies of the coturnix japonica (japanese quail) and gallus gallus domesticus (chicken), which are class ... | 2002 | 12642645 |
| expression of perivitelline membrane glycoprotein zp1 in the liver of japanese quail (coturnix japonica) after in vivo treatment with diethylstilbestrol. | avian perivitelline membrane, an oocyte extracellular matrix homologous to the zona pellucida in mammals or chorion in fish, is composed of at least two glycoproteins. previous studies have indicated that one of the components, a glycoprotein homologous to mammalian zpc, is produced in the granulosa cells of the developing follicles of quail ovary on stimulation with testosterone. however, little is known about the molecular biology of the other component of the avian perivitelline membrane, zp1 ... | 2003 | 12648530 |
| competitive interactions of chlorinated phenol compounds with 3,3',5-triiodothyronine binding to transthyretin: detection of possible thyroid-disrupting chemicals in environmental waste water. | chlorinated phenol compounds, such as the chlorinated derivatives of bisphenol a, have been detected in effluents from paper manufacturing plants. we investigated the effects of bisphenol a, nonylphenol, and their seven chlorinated derivatives on 3,3',5-[(125)i]triiodothyronine ([(125)i]t(3)) binding to purified chicken and bullfrog transthyretin (cttr and bttr) and to the ligand-binding domains of chicken and bullfrog thyroid hormone receptor beta (ctr lbd and btr lbd). the concentrations at wh ... | 2003 | 12649043 |
| effect of different dietary levels of yucca schidigera powder on the performance, blood parameters and egg yolk cholesterol of laying quails. | a total of 135 laying quails (coturnix coturnix japonica), 9 weeks old, were divided into three dietary treatment groups. three replicates were assigned to each treatment group consisting of 15 birds per cage. the diet was supplemented with 0, 100 and 200 ppm yucca schidigera powder and given ad libitum to the quails for a period of 14 weeks. body weight, egg production, feed consumption and feed efficiency were not different due to dietary treatments among the groups. increased egg weight was d ... | 2003 | 12650503 |
| distribution and origin of steroid hormones in the yolk of japanese quail eggs (coturnix coturnix japonica). | the yolk of avian eggs contains steroid hormones, which may influence the development and behaviour of hatched birds. the aim of the present study was to investigate the concentration as well as the distribution of various gonadal steroids in the yolk spheres of quail eggs. steroid concentrations of dissected yolk layers were analysed after alcoholic extraction using enzyme immunoassays (eias) for progesterone, androstenedione and testosterone. to monitor the uptake of testosterone into the yolk ... | 2003 | 12677460 |
| effect of in ovo leptin administration on the development of japanese quail. | potential changes in the activity of endocrine axes related to growth as a result of leptin administration during embryonic development of birds were evaluated in the japanese quail as a model bird with fast growth and development. on day 5 of incubation, 0.1 microg or 1 microg of recombinant mice leptin in 50 microl of phosphate buffered saline were injected into the albumen of eggs. animals from each group were killed by decapitation on day 0, 2, 5, 7, 14, 21, 28, 35, 42, 49 and 56 of life. pl ... | 2003 | 12678663 |
| evaluation of a collagen patch as a method of enhancing ventriculotomy healing in japanese quail (coturnix coturnix japonica). | to assess the ability of a porcine submucosal collagen patch to enhance ventriculotomy healing in quail. | 2011 | 12692754 |
| vascular endothelial growth factor: a regulator of vascular morphogenesis in the japanese quail embryo. | experiments in mouse embryos indicate that a critical level of vegf is required for normal vascular development, as mice lacking a single vegf allele die at midgestation. thus vegf concentration may be a determinant of the size and location of major blood vessels during formation of the primary capillary plexus. ectopic vegf delivery was used to examine the effect of vegf concentration on early vascular patterning in the quail embryo. vegf was delivered by implanting vegf-soaked heparin chromato ... | 2003 | 12704698 |
| presence and developmental regulation of serotonin n-acetyltransferase transcripts in oocytes and early quail embryos (coturnix coturnix japonica). | by rt-pcr two transcripts for arylalkylamine n-acetyltransferase (aa-nat; serotonin n-acetyltransferase; ec 2.3.1.87), the key enzyme in melatonin synthesis, were found, for the first time, in the oocytes and blastoderms from freshly laid eggs (323- and 238-bp rt-pcr products), and one (238-bp product) in the pineal gland of japanese quail (coturnix coturnix japonica). the two products differed by an intron of 85-bp present in the 323-bp band and absent from the 238-bp band. the identity of the ... | 2003 | 12704723 |
| cloning of a partial cdna for japanese quail thyroid-stimulating hormone and effects of methimazole on the thyroid and reproductive axes. | the purposes of this study were to develop a probe for the detection of thyroid-stimulating hormone (tsh) beta subunit mrna, to validate the usefulness of that probe in measuring tsh, and to use it to investigate the effects of thyroid suppression on tsh and the reproductive axis in japanese quail. the objectives of experiment 1 were to isolate and characterize a partial cdna for quail tsh and validate a riboprobe transcribed from this cdna. this riboprobe was then used to assess changes in tshb ... | 2003 | 12705397 |
| maternal dietary lipids alter bone chemical composition, mechanical properties, and histological characteristics of progeny of japanese quail. | this study evaluated the effects of maternal dietary lipids on chemical components and mechanical and histological properties of tibia in progeny of japanese quail fed different dietary lipids. laying hens were fed a basal diet containing either soybean oil (sbo), hydrogenated soybean oil (hsbo), chicken fat (cf), or menhaden fish oil (fo) at 50 g/kg of the diet. the various maternal dietary lipid treatments did not affect growth of progeny at any developmental stage. there were no differences i ... | 2003 | 12705408 |
| protein s100 immunoreactivity in glial cells and neurons of the japanese quail brain. | in mammals, sparse data illustrated the neuronal expression of s100 protein in central and peripheral nervous system. similar studies have not been performed in other vertebrate species, in particular in birds. we provide here a detailed description of the distribution of the calcium-binding protein s100 in neuronal and glial elements in the central nervous system of an avian species, the japanese quail (coturnix japonica) largely used for neuroanatomical and functional studies. the distribution ... | 2003 | 12706207 |
| effect of long-term divergent selection on growth characteristics in japanese quail. | the current study was undertaken to examine the effect of long-term selection for 4-wk bw on growth characteristics in divergent lines of japanese quail and their control. growth rate was significantly higher in males than females in all the lines. there was a significant increase in growth rate of the females selected for increased 4-wk bw over the control females, as well as a significant decline in growth rate of males selected for decreased 4-wk bw compared to their control counterparts. it ... | 2003 | 12710471 |
| cellulitis in japanese quail (coturnix coturnix japonica). | a case of cellulitis was observed in japanese quail (coturnix coturnix japonica) reared for commercial meat production. this condition in japanese quail has not been reported in the literature. this incident was the first, and to date only, occurrence of cellulitis in this processing plant. the cellulitis lesions were localized to the subcutis overlying the breast and inner thigh. carcasses of processed birds and live birds from the affected farm were presented to the poultry diagnostic and rese ... | 2003 | 12713180 |
| melatonin enhances cellular and humoral immune responses in the japanese quail (coturnix coturnix japonica) via an opiatergic mechanism. | it is known that melatonin has important immunomodulatory properties in the japanese quail. however, the mechanism of melatonin action on the immune system is not clearly understood in avian species. in mammals, the immunostimulatory properties of melatonin are mediated by the release of opioid peptides from activated t-lymphocytes. the present study was performed to determine if these same melatonin-induced opioids (mio) are involved with the immunoenhancing effects of melatonin in quail. three ... | 2003 | 12714007 |
| cloning of the genes for the pituitary glycoprotein hormone alpha and follicle-stimulating hormone beta subunits in the japanese crested ibis, nipponia nippon. | we have isolated a part of the gene for the pituitary glycoprotein hormone common alpha subunit (pghalpha) and the whole gene for the follicle-stimulating hormone beta subunit (fshbeta) in the japanese crested ibis (nipponia nippon), a critically endangered bird species in east asia. the nucleotide sequence of a part of the pghalpha gene (5026 bp) contained three exons holding the whole coding and 3' untranslated regions, but lacked a 5' untranslated region. its exon-intron structure was similar ... | 2003 | 12719648 |
| phenotypic flexibility of structure and function of the digestive system of japanese quail. | organisms adjust their phenotype to fluctuating conditions of the environment and to changing internal demands. we report flexible responses of the gizzard and the small intestine of japanese quail to a high-fibre diet. switching from a standard diet to a high-fibre diet results in a highly significant increase in gizzard size, intestine length, mucosal surface, thickness of the intestinal muscular layer and vascularization of the mucosa. after diet switching, increased or decreased gizzard size ... | 2003 | 12728010 |
| extinction of conditioned sexual responses in male japanese quail (coturnix japonica): role of species-typical cues. | the authors examined how a conditioned stimulus (cs) that included species-typical cues affected the acquisition and extinction of conditioned sexual responses in male quail (coturnix japonica). some subjects were conditioned with a cs that supported sexual responses and included a taxidermic head of a female quail. others were conditioned with a similar cs that lacked species-typical cues. pairing the css with access to live females increased cs-directed behavior, with the head cs eliciting sig ... | 2003 | 12735367 |
| dynamics of relative growth rate in japanese quail lines divergently selected for growth and their control. | this study was undertaken to test the hypothesis that relative growth is the same in japanese quail divergently selected for 4-week body weight for 30 generations, and their control. relative growth rate is the increase in body weight per unit of body weight per unit of time, and it represents the efficiency of an animal as a producer of new body mass material. the maximum relative growth rate of the divergent and control lines were observed during the first week. selection for high 4-week body ... | 2003 | 12739845 |
| retinoids, lrat and reh activities in eggs of japanese quail following maternal and in ovo exposures to 3,3',4,4'-tetrachlorobiphenyl. | environmental monitoring for the effects of organochlorine contaminants has identified changes in egg yolk retinoid concentrations, however underlying mechanisms are unknown. breeding female japanese quail, coturnix coturnix japonica, received 3 bimonthly injections of a low dose (5 microg/g) of the coplanar polychlorinated biphenyl (pcb) 3,3',4,4'-tetrachlorobiphenyl. no overt maternal toxicity or embryotoxicity was detected. for the exposed females, oocytes (yolk deposition nearly completed) a ... | 2016 | 12739853 |
| temporal and spatial localization of proteoglycan decorin transcripts during the progression of cholesterol-induced atherosclerosis in japanese quail. | the temporal and spatial distribution of decorin transcripts, endothelial cells, and smooth muscle actin-producing cells were determined during the progression of atherosclerosis in the dorsal aortas of japanese quail selected for cholesterol-induced atherosclerosis. the quail were placed on either a control diet or a diet containing 0.5% added cholesterol at approximately 16 weeks of age. dorsal aortas were collected at 2-week intervals for 18 weeks after initiating cholesterol feeding. in situ ... | 2003 | 12745673 |
| long-term supplementation of various dietary lipids alters bone mineral content, mechanical properties and histological characteristics of japanese quail. | the purpose of this study was to investigate the effects of long-term supplementation of fat in the diets on the fatty acid composition, chemical, mechanical, and histological properties of tibial bone. month-old male japanese quail were fed a basal diet containing either soybean oil (sbo), hydrogenated soybean oil (hsbo), chicken fat (cf), or menhaden fish oil (fo) at 50 g/kg of the diet and maintained on these diets for 7 mo. lipid treatments did not affect body weight, food intake, tibial len ... | 2003 | 12762407 |
| histological preparation of developing vestibular otoconia for scanning electron microscopy. | the unique nature of vestibular otoconia as calcium carbonate biominerals makes them particularly susceptible to chemical deformation during histological processing. we fixed and stored otoconia from all three otolith endorgans of embryonic, hatchling and adult japanese quail in glutaraldehyde containing either phosphate or non-phosphate buffers for varying lengths of time and processed them for scanning electron microscopy. otoconia from all age groups and otolith endorgans processed in 0.1 m p ... | 2003 | 12763239 |
| dietary vitamin c and folic acid supplementation ameliorates the detrimental effects of heat stress in japanese quail. | we evaluated the effects of vitamin c (l-ascorbic acid) and folic acid supplementation on performance, carcass characteristics and concentrations of the oxidative stress markers [malondialdehyde (mda), homocysteine], adrenocorticotropic hormone (acth), vitamins c, e, a, b-12 and folic acid, and mineral status in broiler japanese quail (coturnix coturnix japonica) exposed to high ambient temperature (34 degrees c, 8 h/d, 0900-1700 h). the birds (n = 150; 10-d-old) kept at 34 degrees c were fed a ... | 2003 | 12771333 |
| replication and transmission of influenza viruses in japanese quail. | quail have emerged as a potential intermediate host in the spread of avian influenza a viruses in poultry in hong kong. to better understand this possible role, we tested the replication and transmission in quail of influenza a viruses of all 15 ha subtypes. quail supported the replication of at least 14 subtypes. influenza a viruses replicated predominantly in the respiratory tract. transmission experiments suggested that perpetuation of avian influenza viruses in quail requires adaptation. swi ... | 2003 | 12788625 |
| expression of vascular endothelial growth factor isoforms in the japanese quail embryo. | vascular endothelial growth factor (vegf) i s required for vascular development. in the quail, four vegf isoforms formed by alternative splicing, are translated into proteins with 122, 146, 166, and 190 amino acids. vegf isoforms differ biochemically, with variable affinities for heparan sulfate proteoglycans, the extracellular matrix and vegf receptors. there are few data on the functional significance of vegf isoforms. rt-pcr was used to examine isoform expression during quail vascular develop ... | 2003 | 12795335 |
| effects of probiotics: alone and in a mixture of biosacc plus zinc bacitracin on the caecal microflora of japanese quail. | the aim of this study was to investigate the effects of two commercially available probiotics, alone and in combination with an antibiotic, on the caecal flora of japanese quail (coturnix coturnix japonica) reared under unstressed conditions. thirty-four 90-day-old japanese quail were selected for this study. the birds were divided into four groups, two groups of nine birds and two groups of eight birds. the animals in these groups were given feed containing 0.5 kg per tonne of probiotics alone ... | 2003 | 12801457 |
| variant of perivitelline membrane glycoprotein zpc of japanese quail (coturnix japonica) lacking its cytoplasmic tail exhibits the retention in the endoplasmic reticulum of chinese hamster ovary (cho-k1) cells. | avian perivitelline membrane, an investment homologous to the mammalian zona pellucida, is composed of at least two glycoproteins. our previous studies demonstrated that one of its components, zpc, which is synthesized in the ovarian granulosa cells, is secreted after carboxy-terminal proteolytic processing, and this event is a prerequisite event for zpc secretion in quail. in the present study, we examined the role of the cytoplasmic tail, which is successfully removed after proteolytic process ... | 2003 | 12801980 |
| male japanese quails with female brains do not show male sexual behaviors. | during embryonic development, gonadal steroid hormones (androgens and estrogens) are thought to organize the sexual differentiation of the brain in the heterogametic sexes of higher vertebrates (males in mammals, females in birds). brain differentiation of the homogametic sexes is thought to proceed by default, not requiring sex hormones for sex-specific organization. in gallinaceous birds such as the japanese quail, female brain organization is thought to develop via estrogen-dependent demascul ... | 2003 | 12802009 |
| functional development of small intestine of japanese quail hatched on mir orbital station. | the effect of microgravity on functional development of the small intestine of japanese quails incubated for 2-3 d and hatched on the orbital station mir was examined. after 5 d of space flight duodenal and jejunal alkaline phosphatase (ap) activity of the experimental group was compared with the ap activity in quails of the same age hatched on the earth (laboratory controls). short-term microgravity leading to decreased food intake resulted in significant increase of ap activity in both duodena ... | 2001 | 12807137 |
| effects of microinjection of melatonin into various brain regions of japanese quail on locomotor activity and body temperature. | we previously reported that peripheral administration of melatonin resulted in simultaneous decreases in locomotor activity and body temperature in the japanese quail. to examine the site of these melatonin-induced effects, we performed microinjection of melatonin into various brain regions of the japanese quail. on the basis of the injection site the effects of melatonin were dissociated into four groups: decrease in only body temperature, decrease in only locomotor activity, decrease in both b ... | 2003 | 12821185 |
| molecular cloning and characterization of novel centromeric repetitive dna sequences in the blue-breasted quail (coturnix chinensis, galliformes). | a new family of centromeric highly repetitive dna sequences was isolated from ecori-digested genomic dna of the blue-breasted quail (coturnix chinensis, galliformes), and characterized by filter hybridization and chromosome in situ hybridization. the repeated elements were divided into two types by nucleotide length and chromosomal distribution; the 578-bp element predominantly localized to microchromosomes and the 1,524-bp element localized to chromosomes 1 and 2. the 578-bp element represented ... | 2002 | 12826749 |
| vitellogenin transport and yolk formation in the quail ovary. | morphological and biochemical investigations were made on the yolk formation in ovaries of the quail coturnix japonica. morphologically, two ways of nutrient uptake were observed in follicles. in small oocytes of white follicles, vitellogenin (vtg) was taken up through fluid-phase endocytosis which was assisted by follicular lining bodies. the lining bodies were produced in follicle cells. they adhered to the lateral cell membrane, moved along the membrane in the direction of the enclosed oocyte ... | 2003 | 12832822 |
| foraging behavior and physiological changes in precocial quail chicks in response to low temperatures. | we examined whether low ambient temperatures influence foraging behavior of precocial japanese quail chicks and alter the balance between investment in growth and thermogenic function. to test this, one group of chicks was exposed to 7 degrees c and one group to 24 degrees c during foraging throughout the developmental stage. chicks adapted well to the temperatures through a high flexibility in behavior and physiological development. in response to cold, chicks shortened foraging bout lengths tw ... | 2003 | 12834804 |
| fasting differentially regulates expression of agouti-related peptide, pro-opiomelanocortin, prepro-orexin, and vasoactive intestinal polypeptide mrnas in the hypothalamus of japanese quail. | research in mammals has established the existence of a neuronal network that lies within the hypothalamus and that regulates energy homeostasis. however, it is unknown whether this system has been evolutionarily conserved. the objective of the present study was therefore to examine the influence of the agouti-related peptide (agrp), pro-opiomelanocortin (pomc), prepro-orexin, and vasoactive intestinal polypeptide (vip) genes on energy balance in birds by quantifying the effect of a 24-h fast on ... | 2003 | 12845520 |
| avian melanocortin system: alpha-msh may act as an autocrine/paracrine hormone: a minireview. | the interest in the physiological role of alpha-msh in birds has been limited because they lack the intermediate lobe of the pituitary, the main source of circulating alpha-msh in most vertebrates. recent studies have improved our understanding of the avian melanocortin system. we have cloned and characterized all five mc-r subtypes, pomc, and agrp in chicken. analyses of the tissue distribution of expression of these genes revealed widespread expression throughout the body, corresponding to the ... | 2003 | 12851337 |
| establishing appropriate measures for monitoring aging in birds: comparing short and long lived species. | in order to reveal patterns of reproductive aging in birds we focus on a short lived species, the japanese quail and the american kestrel, which has a life span of medium length. quail have been studied extensively in the laboratory as models for understanding avian endocrinology and behavior, and as a subject for toxicological research and testing. in the lab, japanese quail show age-related deterioration in endocrine, behavioral, and sensory system responses; the american kestrel is relatively ... | 2003 | 12855281 |
| reproductive aging in female birds. | birds are underutilized as animal models for studying the basis of longevity, cellular adaptations for resisting oxidative damage, and delayed reproductive senescence. reproductive aging patterns in female birds range from slightly slower than those in rodents of similar size to extremely slow or even negligible. the best-studied laboratory bird model of female reproductive aging is the relatively short-lived, rapidly aging domestic laying hen. promising long-lived avian models for the prolongat ... | 2003 | 12855282 |
| reduction of salmonella in gnotobiotic japanese quails caused by the enterocin a-producing ek13 strain of enterococcus faecium. | the effect of the enterocin a-producing ek strain of enterococcus faecium on salmonella dusseldorf sa31 was tested in gnotobiotic japanese quails. sixteen 3-day-old gnotobiotic japanese quails, hatched from disinfected eggs placed in sterile boxes, were divided into two groups of 8 birds: a control group, which was inoculated orally with the sa31 strain (1 x 10(7) cfu/ml), and the experimental group, which was inoculated orally with 200 microl of e. faecium (1 x 10(9) cfu/ml), 16 h before infect ... | 2003 | 12872827 |
| effect of early feed restriction on reproductive performance in japanese quail (coturnix coturnix japonica). | reproductive performance of quail (coturnix coturnix japonica) was evaluated following feed restriction (100, 85, and 70% of ad libitum) between 2 to 5 wk of age with three replicates of 12, 2-wk-old chicks per replicate. body weight, feed conversion, and leucocyte distribution were measured during feed restriction. after experimental feed treatment, bw, age at first egg, egg production, fertility, hatchability, and embryonic mortality were evaluated from five replicates of two females and one m ... | 2003 | 12872974 |
| invasion of salmonella enteritidis in the tissues of reproductive organs in laying japanese quail: an immunocytochemical study. | the aim of this study was to determine whether salmonella enteritidis (se) inoculated into the peritoneal cavity would colonize tissues of reproductive organs in japanese quail hens. quail hens regularly laying were intraperitoneally inoculated with 5 x 10(7) or 5 x 10(8) se cells, and the ovary, oviduct, kidney, spleen, liver, and large intestine were excised 24 or 48 h after the treatment. paraffin sections of these organs were immunostained for se. invasion of se was found in the tissues of t ... | 2003 | 12872975 |
| effect of acetyl salicylic acid in drinking water on reproductive performance of japanese quail (coturnix coturnix japonica). | the impact of acetyl salicylic add (asa) on reproductive performance during periods of heat stress was studied in japanese quail (coturnix coturnix japonica). during a season when daily high temperatures averaged between 34 and 40 degrees c, four treatments each containing four replicates of five males and five females were given 0, 0.5, 1.0, or 1.5 g/l asa in drinking water from 34 to 45 wk of age. at 39 wk of age control quail were lighter than quail fed asa. quail receiving 1.5 g/l asa exhibi ... | 2003 | 12872976 |
| effect of feeding time on the reproductive performance of japanese quail (coturnix coturnix japonica). | several feeding regimens are applied to improve performance of fertile egg production during times of heat stress. during a period of heat stress (34 to 36 degrees c), two feeding periods were used to measure the impact of feeding time on reproductive performance of japanese quail (coturnix cotunix japonica) between 44 and 60 wk of age. each feeding time treatment had 25 individually caged male and female pairs. quail were fed ad libitum between 0600 to 1400 or 1400 to 2200 h daily. results indi ... | 2003 | 12872978 |
| impact of egg storage on carbonic anhydrase activity during early embryogenesis in the turkey. | carbonic anhydrase is an enzyme that plays important roles in the conversion of carbon dioxide to bicarbonate, acid-base balance, and in subembryonic fluid formation in the early japanese quail embryo. while turkey egg storage longer than 10 d is known to increase the rate of embryo mortality, little is known of the biological mechanisms that contribute to this phenomenon. in this study, we examined the impact of turkey egg storage on carbonic anhydrase activity in the freshly laid egg through 7 ... | 2003 | 12872979 |
| effect of a cranium-directed daily illumination cycle on the laying rhythm in japanese quail. | this study tests the effect on the laying rhythm of a light cycle reaching directly the encephala via a diode in japanese quail maintained in constant darkness. in dd, all the birds expressed their free-running laying rhythm (period close to 25 h). when the diode is switched on 14 h per 24 h cycle, females showed the same organization as in ld with the same laying time. thus, a photoperiodic cycle, where light was only perceived through the skull of the female quail, could synchronize its laying ... | 2003 | 12876889 |