Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| [effect of monoamines and testosterone on hypothalamo-gonadal complex of japanese quail (an electrophysiological and morphometric study)]. | effects of biogenic amines, testosterone and melatonin both on the developing electrical activity of hypothalamic arcuate nucleus (na) and morphology of testis and na neurocytes during maturation in birds (coturnix coturnix japonica) were tested. slow [symbol: see text]-frequency was shown to prevail at quail na electrical activity. na spectral power gradually enlarges during maturation. the data confirm the evidence that catecholamines induce acceleration of sexual maturation in birds mainly vi ... | 2001 | 11571924 |
| topography of spatially directed conditioned responding: effects of context and trial duration. | domesticated quail (coturnix japonica) received a discrete conditioned stimulus (cs) at one end of the experimental chamber paired with the opportunity to copulate with a female quail (the unconditioned stimulus) in a goal box located 112 cm away. approach to the cs (sign tracking) and approach to the goal area (goal tracking) were measured. the duration of exposure to the experimental context (c) was varied in experiment 1, and the duration of the conditioning trials (t) was varied in experimen ... | 2001 | 11497325 |
| developmental changes in the mrna levels of igf-i and its related genes in the reproductive organs of japanese quail (coturnix coturnix japonica). | summary insulin-like growth factor-i (igf-i) is involved in the regulation of growth and differentiation of a variety of vertebrate tissues. the biological actions of igf-i are mediated mainly by the igf-i receptor (igf-ir) and partly by the insulin receptor (ir) and modulated by igf binding proteins (igfbp). we conducted studies designed to clarify the possible roles of igf system in the development of the avian reproductive organs. we cloned cdnas of igf-i, igf-ir, ir and igfbp-2 of japanese q ... | 2001 | 11437471 |
| effects of embryonic co2 exposure on the adult ventilatory response in quail: does gender matter? | to test the hypothesis that the adult ventilatory response to co2 can be modified by exposure to co2 during development, we exposed japanese quail (coturnix japonica) from two populations to 2% co2 throughout embryonic development. the ventilatory response to 6% co2 was subsequently measured in control and co2-exposed quail following a 6-9 week deacclimation period. in one population of quail, co2-exposed female, but not male, quail had a reduced ventilatory response to 6% co2 as adults (p<0.001 ... | 2001 | 11403781 |
| imitative learning in japanese quail (coturnix japonica) depends on the motivational state of the observer quail at the time of observation. | the 2-action method was used to examine whether imitative learning in japanese quail (coturnix japonica) depends on the motivational state of the observer quail at the time of observation of the demonstrated behavior. two groups of observers were fed before observation (satiated groups), whereas 2 other groups of observers were deprived of food before observation (hungry groups). quail were tested either immediately following observation or after a 30-min delay. results indicated that quail in t ... | 2001 | 11334220 |
| vitamin a deficiency reduces insulin-like growth factor (igf)-i gene expression and increases igf-i receptor and insulin receptor gene expression in tissues of japanese quail (coturnix coturnix japonica). | the insulin-like growth factor (igf) system is regulated by various stimuli, including hormones, growth factors and nutritional status. we examined the effects of vitamin a on components of the igf system in japanese quail. male quail (1 d old) fed a vitamin a-deficient diet for 14 or 21 d developed vitamin a deficiency, as confirmed by a depletion of serum retinol and hepatic retinyl palmitate. consuming the vitamin a-deficient diet for 14 d did not affect growth rate, but decreased the serum i ... | 2001 | 11285324 |
| ultracytochemical study of medullary bone calcification in estrogen injected male japanese quail. | fine structural and cytochemical studies were performed to clarify the pattern of medullary bone calcification, specifically in relation to sulfated glycosaminoglycans, by using estrogen-induced medullary bone of male japanese quails. tibiae were collected at 4 and 7 days after estrogen treatment. medullary bone had developed inward toward the marrow cavity, and calcification had begun near the cortical bone and deeper parts of the trabeculae, accompanied by wide osteoid at extending tips and su ... | 2001 | 11505368 |
| biological suppression of aflatoxicosis in japanese quail (coturnix coturnix japonica) by dietary addition of yeast (saccharomyces cerevisiae). | the amelioration of aflatoxicosis in japanese quails was examined by the dietary addition of live yeast (saccharomyces cerevisiae; sce). yeast incorporated into the diet at 1 g kg(-1) was evaluated for its ability to reduce the deleterious effects of 2.5 mg total aflatoxin (af; 82.30 per cent afb1, 2.06 per cent afb2, 7.68 per cent afg1 and 7.96 per cent afg2) kg(-1)diet on growing japanese quail chicks from 10 days to 45 days of age. forty 10-day-old japanese quail chicks were assigned to 2x2 f ... | 2001 | 11798296 |
| distribution of bisphenol a and tetrabromobisphenol a in quail eggs, embryos and laying birds and studies on reproduction variables in adults following in ovo exposure. | in a previous study, we showed that bisphenol a (bpa) had oestrogen-like effects in bird embryos, causing malformations of the oviducts in japanese quail (coturnix japonica) and feminisation of the left testis in chicken (gallus domesticus). in this study, uptake and distribution of bpa and tetrabromobisphenol a (tbbpa) in embryos and laying quail were examined as well as variables related to reproduction in adult quail following administration of the compounds into the yolk of embryonated eggs. ... | 2001 | 11808920 |
| effect of the mycotoxin aurofusarin on the antioxidant composition and fatty acid profile of quail eggs. | 1. the effect of the mycotoxin aurofusarin on the antioxidant composition and fatty acid profile of quail eggs was investigated. 2. thirty eight 45-d-old japanese quails were divided into two groups (experimental and control, 15 females +4 males in each group) and were fed on a maize-soya diet balanced in all nutrients. the diet of the experimental quails was supplemented with aurofusarin at the level of 26.4 mg/kg feed in the form of fusarium graminearum culture enriched with aurofusarin. at th ... | 2001 | 11811917 |
| expressed sequence tags for the chicken genome from a normalized, ten-day-old white leghorn whole embryo cdna library. 2. comparative dna sequence analysis of guinea fowl, quail, and turkey genomes. | accelerated efforts to develop a high-utility chicken genome map have resulted in the development of resources that may be useful for genetic analysis in other economically important poultry species. here we describe a total of 26 comparative genomic dna sequences (cgs) for the guinea fowl, japanese quail, and domestic turkey developed using 10 primer pairs specific for 10 previously reported, unique, chicken expressed sequence tags (est). the total length of cgs developed for each of the three ... | 2001 | 11558910 |
| cross-species investigations of prenatal experience, hatching behavior, and postnatal behavioral laterality. | turning biases have been reported in some mammalian species, but less is known about such biases in nonmammalians. this study investigated turning biases in domestic chicks, bobwhite and japanese quail, leopard geckos, and snapping turtles. domestic chicks (white leghorn and bantam) and bobwhite quail demonstrate strong group laterality. japanese quail chicks, snapping turtles, and leopard geckos demonstrate no significant group bias. results are discussed with regard to differences in embryonic ... | 2001 | 11568878 |
| gender-related changes in the avian vasotocin system during ontogeny. | the arginine vasotocin (avt) system of the avian brain includes a sexually dimorphic part that extends from the caudal part of preoptic region through the medial part of the bed nucleus of stria terminalis (bstm) to the lateral septum. it is composed of the parvocellular neurons located in the bstm and the dense innervation of the medial preoptic region and lateral septum. in this part of the brain, avt expression is stronger in males than in females in a few bird species investigated to date. t ... | 2001 | 11596147 |
| isolation of pasteurella multocida during an outbreak of infectious septicemia in japanese quail (coturnix coturnix japonica). | in may 1994, about fifty japanese quails out of ninety being bred for experimental purposes at miyazaki university died of acute septicemia within a few days. at autopsy, there were no gross pathological lesions, however, severe bacteremia was observed in all cases. bacterial examination revealed the presence of pasteurella multocida in blood and several organs in pure culture and they were of carter's capsular type a, heddleston's type 3-4 and namioka's type o-8-9. the ld50 of bacteria in quail ... | 2001 | 11642279 |
| exceptional cellular resistance to oxidative damage in long-lived birds requires active gene expression. | previous studies indicated that renal tubular epithelial cells from some long-lived avian species exhibit robust and/or unique protective mechanisms against oxidative stress relative to murine cells. here we extend these studies to investigate the response of primary embryonic fibroblast-like cells to oxidative challenge in long- and short-lived avian species (budgerigar, melopsittacus undulatus, longevity up to 20 years, vs japanese quail, coturnix coturnix japonica, longevity up to 5 years) an ... | 2001 | 11682567 |
| combined effects of experimental heavy-metal contamination (cu, zn, and ch3hg) and starvation on quail's body condition: parallelism with a wild common guillemot (uria aalge) population found stranded at the belgian coast. | combined effects of heavy-metal contamination (cu, zn, and ch3hg) and starvation were tested on common quails (coturnix coturnix japonica) and used as a model for comparison with a wild common guillemot (uria aalge) population found stranded at the belgian coast. appropriate heavy-metal levels were given to the quails to obtain concentrations similar to those found in the seabirds's tissues. the contaminated animals were then starved for 4 d to simulate the evident malnutrition symptoms observed ... | 2001 | 11697781 |
| identification of the suprachiasmatic nucleus in birds. | circadian rhythms are generated by an internal biological clock. the suprachiasmatic nucleus (scn) in the hypothalamus is known to be the dominant biological clock regulating circadian rhythms in mammals. in birds, two nuclei, the so-called medial scn (mscn) and the visual scn (vscn), have both been proposed to be the avian scn. however, it remains an unsettled question which nuclei are homologous to the mammalian scn. we have identified circadian clock genes in japanese quail and demonstrated t ... | 2001 | 11247843 |
| influence of fundamental frequency on stop-consonant voicing perception: a case of learned covariation or auditory enhancement? | for stimuli modeling stop consonants varying in the acoustic correlates of voice onset time (vot), human listeners are more likely to perceive stimuli with lower f0's as voiced consonants--a pattern of perception that follows regularities in english speech production. the present study examines the basis of this observation. one hypothesis is that lower f0's enhance perception of voiced stops by virtue of perceptual interactions that arise from the operating characteristics of the auditory syste ... | 2001 | 11248980 |
| toxicity of coelomic fluid of the earthworm eisenia foetida to vertebrates but not invertebrates: probable role of sphingomyelin. | the coelomic fluid (cf) of the earthworm eisenia foetida exhibits a wide variety of biological activities. we found that the cf was not toxic to 42 species, belonging to seven invertebrate phyla, almost all in aquatic adults and larvae exposed to cf. eleven teleostean species tested died in 0.2-1% cf mostly between 10 and 120 min and the effects were dose-dependent. tadpoles of the toad bufo japonicus formosus died in 0.4-2% cf between 80 and 225 min depending upon size, with larger tadpoles sur ... | 2001 | 11255113 |
| cocaine induces conditioned place preference and increases locomotor activity in male japanese quail. | the conditioned place preference (cpp) procedure is a popular method used for testing the rewarding properties of human drugs of abuse. most cpp studies utilize mammalian models. however, avian species have better visual systems than rodent species, and because the cues that become associated with human drug-taking behavior are often visual, aves might serve as an alternative animal model for investigating drugs of abuse. in three experiments, we examined the locomotor stimulant and rewarding ef ... | 2001 | 11274710 |
| transferring an inborn auditory perceptual predisposition with interspecies brain transplants. | inborn species' perceptual preferences are thought to serve as important guides for neonatal learning in most species of higher vertebrates. although much work has been carried out on experiential contributions to the expression of such preferences, their neural and developmental correlates remain largely unexplored. here we use embryonic neural transplants between two bird species, the japanese quail and the domestic chicken, to demonstrate that an inborn auditory perceptual predisposition is t ... | 2001 | 11320208 |
| chicken microsatellite primers are not efficient markers for japanese quail. | domestic fowl or chicken (gallus gallus) and japanese quail (coturnix japonica) belong to the family phasianidae. the exchange of marker information between chicken and quail is an important step towards the construction of a high-resolution comparative genetic map in phasianidae, which includes several poultry species of agricultural importance. we tested chicken microsatellite markers to see if they would be suitable as genetic linkage markers in japanese quail. twenty-six per cent (31/120) of ... | 2001 | 11419356 |
| effects of testosterone on production of perivitelline membrane glycoprotein zpc by granulosa cells of japanese quail (coturnix japonica). | avian perivitelline membrane, an investment homologous to the zona pellucida of mammalian oocytes, is composed of at least two glycoproteins. previous studies have indicated that one of the components, a glycoprotein homologous to mammalian zpc, is produced and secreted by the granulosa cells of developing follicles of the chicken ovary. in the present study, we evaluated the expression and regulation of zpc in japanese quail (coturnix japonica) granulosa cells both in vivo and in vitro. western ... | 2001 | 11133688 |
| a comparative cytogenetic study of chromosome homology between chicken and japanese quail. | in order to construct a chicken (gallus gallus) cytogenetic map, we isolated 134 genomic dna clones as new cytogenetic markers from a chicken cosmid dna library, and mapped these clones to chicken chromosomes by fluorescence in situ hybridization. forty-five and 89 out of 134 clones were localized to macrochromosomes and microchromosomes, respectively. the 45 clones, which localized to chicken macrochromosomes (chromosomes 1-8 and the z chromosome) were used for comparative mapping of japanese q ... | 2001 | 11978979 |
| complete sequence of the japanese quail (coturnix japonica) mitochondrial genome and its genetic relationship with related species. | the japanese quail (coturnix japonica; jq) is one of the domesticated fowl species of japan. to provide dna sequence information for examination of its phylogenetic position in the order galliformes, the complete sequence of the jq mitochondria was determined. sequence analysis revealed that the jq mitochondrial genome is a circular dna of 16 697 basepairs (bp), which is smaller than the chicken mitochondrial dna of 16 775 bp, but the genomic structure of jq mitochondria was the same as that of ... | 2001 | 11736810 |
| functional conservation of the promoter regions of vertebrate tyrosinase genes. | tyrosinase is the key enzyme for synthesizing melanin pigments, which primarily determine mammalian skin coloration. considering the important roles of pigments in the evolution and the adaptation of vertebrates, phylogenetic changes in the coding and flanking regulatory sequences of the tyrosinase gene are particularly intriguing. we have now cloned cdna encoding tyrosinase from japanese quail and snapping turtle. these nonmammalian cdna are highly homologous to those of the mouse and human tyr ... | 2001 | 11764277 |
| main characteristics of biological components of developing life support system observed during the experiments aboard orbital complex mir. | since 1990, the orbital complex mir has witnessed several incubator experiments for determination of spaceflight effects on embryogenesis of japanese quail. first viable chicks who had completed the whole embryological cycle in mir microgravity hatched out in 1990; it became clear that newborns would not be able to adapt to microgravity unaided. there were 8 successful incubations of chicks in the period from 1990 to 1999. in 1995-1997 the mir-nasa space science program united russian and us inv ... | 2001 | 11695432 |
| effects of neurotoxin 6-aminonicotinamide on levels of enzyme activities and metabolites in quail plasma. | effects of 6-aminonicotinamide (6-an) on the levels of proteins, metabolites and enzyme activities in the plasma of japanese quail were investigated. the concentrations of soluble proteins in the pectoral and hindlimb muscle of the 6-an treated and the pair-fed groups were significantly reduced compared to the control group. in the plasma, the levels of total proteins and albumin were not affected, but the levels of globulin were significantly lower than those of the control and pair-fed groups. ... | 2001 | 11378442 |
| collagen characteristics and organization during the progression of cholesterol-induced atherosclerosis in japanese quail. | this study reports the concentration of collagen and its hydroxypyridinoline crosslinks, collagen fibril organization in the dorsal aortas, and systolic blood pressure during the progression of atherosclerosis in japanese quail selected for cholesterol-induced atherosclerosis. the quail were placed on either a control or 0.5% cholesterol-added diet at approximately 16 weeks of age. the concentration of total collagen did not change in the control arteries during the course of the study, whereas ... | 2001 | 11368425 |
| double immunocytochemistry of vasoactive intestinal peptide and cgnrh-i in male quail: photoperiodic effects. | reproduction in japanese quail is primarily regulated by photoperiod. vasoactive intestinal peptide (vip) has been suggested as a transducer of environmental information, especially photoperiodic cues, to the hypothalamo-pituitary-gonadal axis. to investigate the possible interaction of vip and the reproductive (gonadotropin-releasing hormone, gnrh) system, double-immunocytochemical staining for vip and cgnrh-i was conducted in sexually mature male quail held under a long-day photoperiod (16l:8d ... | 2001 | 11320656 |
| retinoid nutritional status differently affects the expression of japanese quail retinoic acid receptor-beta isoform transcripts in a tissue-specific manner. | we investigated the effects of vitamin a (va) nutritional status on the levels of expression of retinoic acid (ra) receptor-beta (rarbeta) gene in the various tissues of japanese quail. va deficiency caused a significant decrease in the mrna levels of brain, liver, heart, lung and kidney rarbeta2/beta4, whereas no change was observed in the level of testis rarbeta2 transcript. in contrast, reduction in the rarbeta1 transcript caused by va depletion was observed only in the lung, remaining unchan ... | 2001 | 11312145 |
| quail and other short-lived birds. | japanese quail are small galliforms that are migratory and generally live 2 to 3years in the wild. although there is evidence for other environmental cues, they primarily respond to long daylength for regulation of reproduction. in contrast to the common tern, a long-lived sea bird that shows little evidence of reproductive aging, japanese quail follow a well-defined process of aging with evidence of declining function in reproductive, metabolic, and sensory systems. our studies focus on neuroen ... | 2001 | 11295519 |
| circadian organization and the role of the pineal in birds. | all organisms exhibit significant daily rhythms in a myriad of functions from molecular levels to the level of the whole organism. significantly, most of these rhythms will persist under constant conditions, showing that they are driven by an internal circadian clock. in birds the circadian system is composed of several interacting sites, each of which may contain a circadian clock. these sites include the pineal organ, the suprachiasmatic nucleus (scn) of the hypothalamus, and, in some species, ... | 2001 | 11279670 |
| detection of deoxyribonuclease i and ii activities in japanese quail oocytes. | birds exhibit physiological polyspermy, i.e. numerous spermatozoa enter the germinal disc of an oocyte and form pronuclei during fertilisation. however, only one of them unites with the female pronucleus to form a zygote nucleus; the supernumerary spermatozoal nuclei degenerate at the early cleavage stages. to establish a factor responsible for spermatozoal degeneration, the presence of dnase activity was studied in vitro in extracts of japanese quail oocytes using lambda dna/hindiii as a substr ... | 2001 | 11273029 |
| steroid hormones during embryonic development in japanese quail: plasma, gonadal, and adrenal levels. | the purpose of this experiment was to measure plasma, gonad, and adrenal steroid hormones during embryonic and early posthatch development in japanese quail. blood plasma samples were collected from male and female japanese quail embryos at 2-d intervals between day 10 of incubation and day 5 posthatch. gonads and adrenal glands were collected from a separate set of embryos at the same ages. concentrations of androgen (testosterone and 5alpha-dihydrotestosterone) and 17beta-estradiol (e2) were d ... | 2001 | 11441848 |
| differential regulation of igfbp-2 and igfbp-5 gene expression by vitamin a status in japanese quail. | to investigate the involvement of the insulin-like growth factor (igf) system in vitamin a (va)-supported growth, we examined the effects of va status on igf binding protein (igfbp)-2 and -5 gene expression in japanese quail. va deficiency caused a reduction in igfbp-2 mrna only in lung, without effect in other tissues. however, the expression of igfbp-5 mrna was more sensitive to the change of va status. igfbp-5 mrna levels were significantly reduced by va depletion in a tissue-specific manner, ... | 2001 | 11404231 |
| divergent selection for shape of growth curve in japanese quail. 1. responses in growth parameters and food conversion. | 1. hg and lg quail lines selected for high and low relative weight gain between 11 and 28 d of age (rg11-28), respectively, and an unselected c line were compared. mature body weight of both selected lines was held at that of the c line. progeny of generation 6 were used for analysis. 2. divergent selection for rg11-28 brought about opposite changes in the growth rates shortly after hatching. 3. parameters of the richards function were used to describe the growth curve. the largest differences b ... | 2001 | 11811909 |
| effect of melatonin on circadian rhythm, locomotor activity and body temperature in the intact house sparrow, japanese quail and owl. | we compared the effect of melatonin on circadian rhythm, body temperature, and locomotion in the intact house sparrow, japanese quail and owl. daily treatment with melatonin at a fixed time did not entrain the free-running rhythm of locomotor activity in the house sparrow and the disrupted rhythm in japanese quail under constant dim light. however, melatonin clearly inhibited movement for several hours after treatment. the duration of resting after injection of melatonin was dose-dependent. body ... | 2001 | 11166707 |
| day length has a major effect on the response of protein synthesis rates to feeding in growing japanese quail. | we investigated the effect of day length on mixed protein fractional synthesis rates (k(s)) in 14- and 21-d-old japanese quail (coturnix c. japonica) habituated to either a long day length, 18 h light/6 h dark (ldl), or short day length, 6 h light/18 h dark (sdl), with free access to food during the light period. rates of protein synthesis were measured by a flooding dose of l-[1-(13)c]leucine. in both groups, we measured k(s) of pectoral muscle, liver and heart after an overnight period of food ... | 2001 | 11160545 |
| effects of vitamin e and selenium on performance, digestibility of nutrients, and carcass characteristics of japanese quails reared under heat stress (34 degrees c). | this study was conducted to determine the effects of vitamin e (dl-alpha-tocopheryl acetate) and selenium (se; na2-seo3) on performance, digestibility of nutrients and carcass characteristics of japanese quails reared under chronic heat stress (34 degrees c). a total of 120 10-day-old japanese quails were randomly assigned to four treatment groups, three replicates of 10 birds each. the birds with a 2 x 2 factorial design received either two levels of vitamin e (125 and 250 mg/kg of diet) or two ... | 2001 | 11906558 |
| effects of vitamin c and vitamin e on performance, digestion of nutrients and carcass characteristics of japanese quails reared under chronic heat stress (34 degrees c). | this study was conducted to determine the effects of vitamin c (l-ascorbic acid) and vitamin e (dl-alpha-tocopheryl acetate) on performance, digestion of nutrients and carcass characteristics of japanese quails reared under chronic heat stress (34 degrees c). a total of 180 10-day-old japanese quails were randomly assigned to six treatment groups, three replicates of 10 birds each. the birds with a 2 x 3 factorial design received either two levels of vitamin c (100 and 200 mg/kg of diet) or thre ... | 2001 | 11906557 |
| the control of preoptic aromatase activity by afferent inputs in japanese quail. | this review summarizes current knowledge on the mechanisms that control aromatase activity in the quail preoptic area, a brain region that plays a key role in the control of reproduction. aromatase and aromatase mrna synthesis in the preoptic area are enhanced by testosterone and its metabolite estradiol, but estradiol receptors of the alpha subtype are not regularly colocalized with aromatase. estradiol receptors of the beta subtype are present in the preoptic area but it is not yet known wheth ... | 2001 | 11744073 |
| dietary administration of dimethoate to the japanese quail: reproductive effects and successful hatchability of eggs. | 2001 | 11692194 | |
| classification of hybrid crows in quail using artificial neural networks. | in galliforms, calls are strongly determined genetically and no influence of learning has ever been demonstrated. hybridization is a useful tool for investigating patterns of heritability. the vocal repertoire of the european quail (coturnix c. coturnix) and of the japanese quail (c. c. japonica) are similar except for their crows. the european quail possesses two forms of crows and the japanese quail only one form. we produced hybrids from the following crosses; f(1), f(2) and backcrosses. visu ... | 2001 | 11672936 |
| restriction of proliferation of primordial germ cells by the irradiation of japanese quail embryos with soft x-rays. | primordial germ cells (pgcs) are the progenitor cells for the gametes. avian pgcs are located in the central region of the area pellucida at the blastoderm stage. shortly after further incubation, they migrate to the extra-embryonic germinal crescent, and then as soon as the blood vessels form, they enter the circulation and finally settle in the gonadal primordium. we have developed a simple method using soft x-ray irradiation (18 kv power, 20 cm distance) to reduce the number of pgcs in japane ... | 2001 | 11672689 |
| sexual dimorphism in the neuronal circuits of the quail preoptic and limbic regions. | a sexually dimorphic nucleus is located in the preoptic area of japanese quail and plays a key role in the activation of male copulatory behavior. the medial preoptic nucleus (pom) is significantly larger in adult male than in adult female quail. its volume is steroid-sensitive in adulthood and consequently decreases after castration but is restored to normal levels by a treatment with exogenous testosterone. this volumetric difference appears to result only from a sex difference in the adult ho ... | 2001 | 11668649 |
| sexual differences and effect of photoperiod on melatonin receptor in avian brain. | several data suggest that melatonin may influence avian reproduction by acting at the level of the hypothalamic-hypophisial-gonadal axis, and/or on neural circuits controlling reproductive behaviours. the action of melatonin is exerted through specific receptors whose distribution and pharmacological properties have been extensively investigated. this review will focus on the distribution, sexual dimorphism, and dependence upon the photoperiod of melatonin binding sites in avian species with a s ... | 2001 | 11596148 |
| maternal dietary lipids modify composition of bone lipids and ex vivo prostaglandin e2 production in early postnatal japanese quail. | this study examined the effects of maternal dietary lipids on fatty acid composition and ex vivo prostaglandin e2 (pge2) biosynthesis in bone tissues of progeny of japanese quail. laying hens were fed a basal diet containing soybean oil (sbo), hydrogenated soybean oil (hsbo), poultry fat (pf), or menhaden fish oil (fo) at 50 g/kg of diet. fertilized eggs were incubated, and newly hatched quail were used for tibial fatty acid analysis and pge2 measurement or were fed an identical diet until 2 wk ... | 2001 | 11558921 |
| neuroendocrine and behavioral implications of endocrine disrupting chemicals in quail. | studies in our laboratory have focused on endocrine, neuroendocrine, and behavioral components of reproduction in the japanese quail. these studies considered various stages in the life cycle, including embryonic development, sexual maturation, adult reproductive function, and aging. a major focus of our research has been the role of neuroendocrine systems that appear to synchronize both endocrine and behavioral responses. these studies provide the basis for our more recent research on the impac ... | 2001 | 11534988 |
| different influence of hypodynamy on calcium and phosphorus levels in bones of male and female japanese quails. | the influence of long-term hypodynamy on the calcium and phosphorus levels was studied in the bones of japanese quails. the hypodynamy evoked different changes in the calcium and phosphorus content in males and females. the calcium content in the marrow of femurs was only changed in the hens, while in cockerels it was significantly decreased in the upper part and marrow of the tibia. furthermore, changes in the phosphorus content were observed only in the tibia of cockerels. | 2001 | 11522048 |
| auditory nerve fiber differences in the normal and neurofilament deficient japanese quail. | a primary axonal disease affecting the central and peripheral nervous system was discovered in a mutant strain of the japanese quail, named quiver (quv). we have previously demonstrated altered auditory evoked potentials in the neurofilament (nf) deficient quail. in this current study we attempt to find relationships between the auditory evoked potential results and the histo-pathological abnormalities of the auditory neurons. no abnormalities in the external auditory meatus and tympanic cavity ... | 2001 | 11520639 |
| expression of melatonin receptor transcripts (mel-1a, mel-1b and mel-1c) in japanese quail oocytes and eggs. | cloning and sequencing of the cdna for avian melatonin (mel) receptors have made it possible to investigate the expression of these receptors in different animal tissues and organs by reverse transcription polymerase chain reaction. our study demonstrates for the first time, the presence of mel receptor transcripts in maternal rna from japanese quail oocytes and in rna from the early embryos of the laid eggs. specific primers permitted discrimination between mel-1a, mel-1b and mel-1c receptor se ... | 2001 | 11508743 |
| 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 |
| a comparative study of embryonic development of japanese quail selected for different patterns of postnatal growth. | patterns of early embryonic development have traditionally been viewed as invariant within vertebrate taxa. it has been argued that the specific differences which are found arise during the later stages of development. these differences may be a result of allometry, heterochrony or changes in relative growth rates. to test whether early embryonic development is indeed invariant, or whether selection of adult characteristics can alter embryonic growth, we compared embryonic development in birds s ... | 2001 | 16351825 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| [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 |
| protective role of supplemental vitamin e and selenium on lipid peroxidation, vitamin e, vitamin a, and some mineral concentrations of japanese quails reared under heat stress. | this study was conducted to determine the effects of vitamin e and selenium (se) on lipid peroxidation (mda), serum and liver concentration of antioxidant vitamins, and some minerals of japanese quails reared under heat stress (34 degrees c). one hundred twenty 10-d-old japanese qualis (60 males, 60 females) were randomly assigned to 4 treatment groups, 3 replicates of 10 birds each. the experiment was designed in a 2x2 factorial arrangement using two levels of vitamin e (125 and 250 mg/kg of di ... | 2002 | 11881799 |
| effect of selection for increased body weight and increased plasma yolk precursor on developmental stability in japanese quail. | developmental stability of several japanese quail lines was measured by bilateral asymmetry. lines included in the study were as follows: a randombred control (r1), sublines of r1 selected for increased (hw line) and decreased (lw line) 4-wk bw, and sublines of r1 selected for increased (hp line) or decreased (lp line) total plasma phosphorus (tpp; a measure of yolk precursor in the blood) at the beginning of lay. in sublines of the hw line, the males were selected for increased 4-wk bw and the ... | 2002 | 11873824 |
| an unusual mechanism of disposal of superfluous spermatozoa in vasectomised quails. | as part of a series of studies designed to evaluate usual and potential functions of epithelial cells in the avian epididymis under varying circumstances, adult, sexually active male japanese quails were vasectomised for 3, 6 and 8 weeks. the testes, epididymides and deferent ducts were studied histologically and ultrastructurally. testicular lesions were minimal, but epididymal response was profound. non-ciliated (type i) cells of the proximal efferent duct (ped) actively phagocytized spermatoz ... | 2002 | 12076112 |
| the parvocellular vasotocin system of japanese quail: a developmental and adult model for the study of influences of gonadal hormones on sexually differentiated and behaviorally relevant neural circuits. | vasotocin (vt; the antidiuretic hormone of birds) is synthesized by diencephalic magnocellular neurons projecting to the neurohypophysis. a sexually dimorphic system of vt-immunoreactive (ir) parvocellular elements has been described within the male medial preoptic nucleus (pom) and the nucleus of the stria terminalis, pars medialis (bstm). vt-ir fibers are present in many diencephalic and extradiencephalic locations, and quantitative morphometric analyses demonstrated their sexually dimorphic d ... | 2002 | 12060839 |
| cyclic melatonin synchronizes the circadian rhythm of feeding activity in japanese quail, coturnix c. japonica. | in japanese quail, we can observe the circadian rhythm of feeding activity in constant conditions, especially in birds from selected lines. in order to try to test the importance of melatonin as hormonal output for the circadian system, we gave a 24-h period cycle of exogenous melatonin to some of these birds when they were free running. we used castrated males firstly in order to cancel the known effect of steroids on circadian organisation. secondly, as castrated birds generally expressed a ve ... | 2002 | 12017768 |
| neurons expressing neuropeptide y mrna in the infundibular hypothalamus of japanese quail are activated by fasting and co-express agouti-related protein mrna. | the neural mechanisms involved in the compensatory hyperphagia exhibited by many vertebrate species after a fast are not fully understood but, in mammals, appear to involve nutritionally-sensitive neurons that co-express neuropeptide y (npy) and agouti-related protein (agrp) in the infundibular hypothalamus. we investigated whether these neurons have been evolutionarily conserved in a non-mammalian vertebrate, the japanese quail. birds exhibited compensatory hyperphagia 1 h after return of food ... | 2002 | 12008019 |
| role of carbon dioxide and ion transport in the formation of sub-embryonic fluid by the blastoderm of the japanese quail. | 1. the explanted blastoderm of the japanese quail was used to explore the role of ions and carbon dioxide in determining the rate of sub-embryonic fluid (sef) production between 54 and 72 h of incubation. 2. amiloride, an inhibitor of na+/h+ exchange, at concentrations of 10(-3) to 10(-6) m substantially decreased the rate of sef production when added to the albumen culture medium. n-ethylmaleimide, an inhibitor of v type h+ atpase, also decreased this rate but only to a small extent at the high ... | 2002 | 12003326 |
| attenuation of ca(2+)-activated atpase and shortening velocity in hypertrophied fast twitch skeletal muscle from aged japanese quail. | the effect of aging on the in vitro contractile properties of the patagialis (pat) muscle of 35 young adult (ya; 8 weeks of age) and 35 aged adult (aa, 110 weeks of age) coturnix quails was examined after 0-30 days of stretch-overload. overload was achieved by placing a weight equivalent to 12% of the birds' body weight on one wing. the contralateral wing served as the intra-animal control. overload increased the weight of the pat by 45.1+/-2.1% in ya, and 24.1+/-2.6% in aa. twitch contraction t ... | 2002 | 11909684 |
| purification of soluble acetylcholinesterase from japanese quail brain by affinity chromatography. | the purification of a soluble acetylcholinesterase from japanese quail brain using affinity chromatography on concanavalin a-sepharose and edrophonium-sepharose is described. the affinity matrix was synthesized by coupling an inhibitor edrophonium to epoxy-activated sepharose. acetylcholinesterase was purified 10,416-fold with a specific activity of 2500 u/mg protein. polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate and mercaptoethanol gave only one band with a molecu ... | 2002 | 11809423 |
| 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 |
| chromium supplementation can alleviate negative effects of heat stress on egg production, egg quality and some serum metabolites of laying japanese quail. | this study was conducted to determine the effects of cr (chromium picolinate, crpic) supplementation at various levels (0, 200, 400, 800 or 1200 microg/kg of diet) on egg production, egg quality and serum concentrations of insulin, corticosterone and glucose in laying japanese quail (coturnix coturnix japanica) reared under conditions of heat stress (32.5 degrees c). laying japanese quail (n = 150; 45 d old) were divided into five groups of 30 birds. the quail were fed either a control diet cont ... | 2002 | 12042444 |
| [polychromatism of the egg shell in the domestic quail (coturnix coturnix japonica). 5. augmentation of the incidence of phenodeviants through consanguinity]. | an observation of interest is that brother-sister inbreeding appears to have increased the size of protoporphyrin spots of wild type egg-shells in japanese quail. phenodeviant theory can explain the modalities of trait segregation. | 2002 | 134795 |
| [polychromatism in eggshell or domestic quail (coturnix coturnix japonica). iv. porphyrin biosynthesis in uteri of phenotypes belonging to the dominant form]. | with the introduction of delta-aminolevulinic acid, uterin extracts, in vitro, can synthesize porphyrins (uroporphyrin, 62%; coproporphyrin, 27%; and protoporphyrin, 11%). at the stage where the uterus contains a white egg, various phenotypes in the dominant form are capable of synthesizing with the introduction of delta-aminolevulinic acid, the same quantity of porphyrins. these results are interpreted, assuming the existence of differences in the activity of the enzymes involved during the lay ... | 2002 | 126744 |
| [polychromatism of the egg shell in the domestic quail (coturnix coturnix japonica). 6. comparison with polychromatism in related species]. | polychromatism and pigments of five phasianides egg-shells others than japanese quail are studied. polychromatism modalities and pigments repartitions are species specific. | 2002 | 134796 |
| [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 |
| 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 |
| testing homology of loci for two plumage colors, "lavender" and "recessive white," with chicken and japanese quail hybrids. | homology for two plumage color loci was studied by hybridization between chickens and japanese quail. first, chicken-quail hybrids were produced from homozygous "lavender" chicken cocks and "bleu" japanese quail, and all 30 hybrids had the same parental slate blue plumage color. on the other hand, no hybrids with this plumage were obtained out of 18 progeny from the same cocks and wild-type quail. these results show that the slate blue plumage color is determined by homologous loci in japanese q ... | 2002 | 12011184 |
| phylogenetic analysis in chicken breeds inferred from complete cytochrome b gene information. | complete cytochrome b (cyt b) gene (1140 bp) nucleotide sequences were used to investigate characteristics of the genetic constitution of chunky broiler chickens, and these were compared with the hy-line and wl-gm (garber) line of white leghorn, the gsp line of fayoumi, the bm-c line of black minorca (egg-chickens), and an outgroup of wild-origin japanese quail. a high genetic difference (five haplotypes) was observed at the cytochrome b region in the chunky broiler in contrast to the high homol ... | 2002 | 12017507 |
| expression of myostatin is not altered in lines of poultry exhibiting myofiber hyper- and hypoplasia. | decades of selective breeding have yielded lines of poultry with substantial myofiber hyperplasia, vet little is known about what genes have been altered during the course of selection. myostatin is a strong negative regulator of muscle mass in mice and cattle and could have been one of many genetic factors contributing to increased myofiber deposition in growth-selected lines of poultry. to test this hypothesis, the sequence and expression patterns of myostatin were analyzed in growth-selected ... | 2002 | 12079046 |
| microsatellite loci in japanese quail and cross-species amplification in chicken and guinea fowl. | in line with the gifu university's initiative to map the japanese quail genome, a total of 100 japanese quail microsatellite markers isolated in our laboratory were evaluated in a population of 20 unrelated quails randomly sampled from a colony of wild quail origin. ninety-eight markers were polymorphic with an average of 3.7 alleles per locus and a mean heterozygosity of 0.423. to determine the utility of these markers for comparative genome mapping in phasianidae, cross-species amplification o ... | 2002 | 12081810 |
| [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 |
| 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 |
| 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 |
| 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 |
| 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 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 | |
| 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 |
| 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 |
| 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 |