Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| hematology of japanese quail selected for high or low serum corticosterone responses to complex stressors. | blood was collected from random-bred male coturnix coturnix japonica and from quail selected genetically for high or low serum corticosterone responses to complex stressors after chronic exposure to short daily photoperiods and after exposure to long photoperiods. when compared to the low response quail, high response quail exhibited increased mean cellular hemoglobin values, reticulocyte numbers and heterophil percentages, and decreased monocyte and eosinophil numbers after exposure to long pho ... | 1987 | 2881699 |
| reticulocyte numbers in japanese quail chicks. | erythrocyte parameters in coturnix coturnix japonica were evaluated daily during the first 2 weeks after hatching. nadirs in total circulating erythrocyte numbers, hematocrit percentages, and hemoglobin concentrations were found during the first 5 days posthatch. reticulocytosis from 4 to 9 days posthatch ameliorated these nadirs until 12 days posthatch, when secondary nadirs appeared. erythropoiesis was indicated by reticulocytosis when hemoglobin levels decreased. reticulocyte maturation was i ... | 2010 | 2881700 |
| effect of cage density and rank in peck order on brain regional monoamines in adult male coturnix coturnix japonica. | 1. in adult male coturnix coturnix japonica neither norepinephrine (ne) nor serotonin (5ht) in various brain regions were affected by caging density (174 cm2-8/cage; 348 cm2-4/cage; 696 cm2-2/cage). dopamine (da) in diencephalon was elevated in high density cages. 2. peck order rank was assigned on the basis of feather distribution on head, neck and back and lesions on head and back. 3. upper strata peck order rank was associated with significantly lower levels of brain regional ne and da compar ... | 1987 | 2886268 |
| leukocyte numbers during the humoral and cell-mediated immune response of japanese quail after microwave irradiation in ovo. | 1. coturnix coturnix japonica eggs were exposed to 2.45-ghz continuous wave microwave radiation at an incident power density of 5 mw/cm2 (sar = 4 mw/g) during the first 12 days of embryogeny. after hatching, leukocyte differential changes were measured in response to an injection with alectoris graeca chukar red blood cells (crbc) and in response to a phytohemagglutinin (pha) injection in irradiated and nonirradiated (sham) quail of both sexes. 2. microwave irradiation did not affect anti-crbc h ... | 1987 | 2886278 |
| leukocyte numbers in hemorrhaged japanese quail after microwave irradiation in ovo. | 1. coturnix coturnix japonica eggs were exposed to 2.45-ghz continuous wave microwave radiation at an incident power density of 5 mw/cm2 (and a specific rate of 4 mw/g) during the first 12 days of embryogeny. after hatching, hematological changes in response to an acute hemorrhage were measured in exposed and nonexposed (control) juveniles of both sexes. 2. exposure did not affect erythroid cell numbers either before or after hemorrhage. 3. exposure affected the recovery of lymphocyte and hetero ... | 2010 | 2887391 |
| hematological response of hemorrhaged japanese quail after blood volume replacement with saline. | 1. hematological responses to hemorrhage by phlebotomy with and without replacement of blood volume with saline were measured in juvenile and adult male coturnix coturnix japonica. 2. recovery of total peripheral erythrocyte numbers and total peripheral leukocyte numbers occurred within 72 hr postphlebotomy in both treatment groups. 3. saline replacement of blood volume following hemorrhage increased the total numbers and differential percentages of circulating reticulocytes at 72 hr postphlebot ... | 1987 | 2887392 |
| a lewis x hapten is the major glycolipid of japanese quail intestine. | a fucolipid isolated from japanese quail intestine was identified as beta-galactosyl-1,4-(alpha-fucosyl-1,3-) beta-n-acetylglucosaminyl-1,3-beta-galactosyl-1,4-beta-glucosyl-1,1-cera mide, a glycolipid which exhibits x-hapten activity. analysis of the tissue at various embryonic stages showed that the fucolipid is characteristically present at later stages of organogenesis. | 1987 | 2888753 |
| isolation and characterization of single myocardial cells from the quail, coturnix coturnix japonica. | 1. the enzymatic cell isolation technique was applied to the bird heart resulting in myocytes of which 10-50% maintained their spindle-shaped morphology, excluded the vital dye, evans blue and tolerated physiological concentration of ca2+ ions. 2. the length of spindle-shaped myocytes was on average 289 +/- 7 microns, and the maximum width was 10.2 +/- 0.3 microns. the mean length of the sarcomeres was 2.18 +/- 0.03 microns. 3. in electron micrographs the fine structure of the spindle-shaped myo ... | 1987 | 2889569 |
| blood volume recovery in hemorrhaged japanese quail. | 1. blood volume and plasma biochemical changes and feed and water consumption in response to a hemorrhage by phlebotomy of 30% of the calculated total blood volume with and without replacement of blood volume with physiological saline were determined in juvenile male coturnix coturnix japonica. 2. plasma protein and osmolality decreased rapidly posthemorrhage and did not recover by 72 hr posthemorrhage. 3. plasma glucose, na+ and k+ increased within 1 hr postphlebotomy. plasma na+ returned to no ... | 1987 | 2889580 |
| hematological effects of ethyl methanesulfonate, paraquat and phenylhydrazine in japanese quail. | 1. juvenile coturnix coturnix japonica males were injected intravenously with 2, 20 or 200 mg ethyl methanesulfonate (ems)/kg body wt; 0.2, 2 or 20 mg paraquat (para)/kg body wt; or 0.6, 6 or 60 mg phenylhydrazine (phz)/kg body wt; and hematologic variables were measured at 0 (non-injected), 24 and 72 hr post-injection. 2. ems, para and phz-induced hemolytic anemia began within 24 hr post-injection. 3. recovery from anemia began within 72 hr post-injection of ems or para, but phz injected quail ... | 2000 | 2894271 |
| plasma corticosterone in hemorrhaged japanese quail after microwave irradiation in ovo. | 1. sexually immature male and female japanese quail were divided within each sex into three treatment groups: hemorrhaged by jugular puncture; immobilized for 2 min, but not hemorrhaged (shams); and neither immobilized nor hemorrhaged (controls). 2. hemorrhage resulted in increased plasma corticosterone levels in both sexes. corticosterone levels in shams were higher than in controls. 3. in another experiment, japanese quail eggs were irradiated during incubation with 2.45 ghz cw microwave radia ... | 1988 | 2896572 |
| serum enzymes in hemorrhaged japanese quail after microwave irradiation during embryogeny. | 1. japanese quail eggs were exposed to 2.45 ghz continuous wave microwave radiation at an incident power density of 5 mw/cm2 and a specific absorption rate of 4.03 mw/g during the first 12 days of embryogeny. 2. after hatching, serum biochemical changes in response to hemorrhagic stress were measured following a hemorrhage of 30% of the calculated total blood volume. 3. lactate dehydrogenase, beta-glucuronidase, acid phosphatase, glucose and protein were not affected by microwave irradiation dur ... | 1988 | 2899471 |
| drinking induced by cellular dehydration in the quail, coturnix coturnix japonica. | 1. drinking was induced in water-replete quail 5-10 min after intravenous injection of hypertonic nacl (0.69 osmol/l) or sucrose (1.06 osmol/l), but hypertonic urea (2.78 osmol/l) failed to induce drinking. 2. the birds drank approximately the amount required to dilute the injected solutes to isotonicity for each given dose of nacl or sucrose. 3. the plasma angiotensin ii level decreased after injection of 7% nacl (2.5 osmol/l), but it increased after injection of an equi-osmolar solution of suc ... | 1988 | 2900120 |
| chicken embryo cell line exhibits japanese quail markers. | 1988 | 2903854 | |
| the claude bernard lecture, 1987. embryonic chimeras: a tool for studying the development of the nervous and immune systems. | chimeras have been constructed in the avian embryo following the observation of the particular structure of the interphase nucleus in the japanese quail (coturnix coturnix japonica). in all embryonic and adult cell types of this species a large amount of heterochromatin is associated with the nucleolus, making quail cells readily distinguishable from those of the chick where the constitutive heterochromatin is evenly dispersed in the nucleus. these structural differences have been used to devise ... | 1988 | 2907137 |
| aromatase activity in quail brain: correlation with aggressiveness. | testosterone (t) triggers aggressive behavior in males of many vertebrate species; however, the neural and hormonal basis of individual differences in the frequency or intensity of aggressive behavior is still debated. using the japanese quail (coturnix coturnix japonica), a species in which individuals exhibit a wide range of aggressiveness in nature and the laboratory, together with a newly devised test procedure for quantifying aggressiveness, we recently demonstrated that aggression is estro ... | 2010 | 2909376 |
| histochemical studies of ca-atpase, succinate and nad+-dependent isocitrate dehydrogenases in the shell gland of laying japanese quails: with special reference to calcium-transporting cells. | in order to elucidate the problem of which cells are involved in calcium transport and to estimate the role of mitochondria in calcium transport in the avian shell gland, the fine structure and the ca-atpase, succinate dehydrogenase (sdh) and nicotinamide adenine dinucleotide (nad+)-dependent isocitrate dehydrogenase (nad+-icdh) activity of the shell gland of egg-laying japanese quails were examined. the surface epithelial cells, consisting of ciliated cells with cilia and microvilli and non-cil ... | 1985 | 2931410 |
| the role of thyroid and adrenal cortical hormones in the modulation of the gonadal function in birds. | the role of the thyroid gland in modulating the gonad function depends on the functional state of the gonads. in sexually inactive (short-day's) male japanese quails, thyroidectomy and thyroxine treatment prove ineffective. thyroxine administered simultaneously with photo-gonadostimulation inhibits the maturation of the gonads: the testes decrease in weight, the metabolic clearance rate of testosterone accelerates, resulting in a decrease in the plasma level, and androsterone production increase ... | 1985 | 2938378 |
| [development of the ovarian and oviduct arteries of the japanese quail (coturnix coturnix japonica) after hatching]. | 1986 | 2948420 | |
| effects of metabolism inhibitors, antiestrogens and antiandrogens on the androgen and estrogen induced sexual behavior in japanese quail. | the relative contribution of androgenic and estrogenic metabolites of testosterone to the activation of sexual behavior was studied in japanese quail by using inhibitors of testosterone metabolism, antiestrogens and antiandrogens. these compounds were tested in castrated birds whose sexual behavior had been activated by silastic implants of testosterone (t) or daily injections of testosterone propionate (tp) or diethylstilboestrol (des). the aromatase inhibitor atd only depressed t-induced behav ... | 1986 | 2950530 |
| on the histochemical characterization and distribution of fast and slow muscle fibers in certain avian skeletal muscles. | histochemical techniques based upon the ph sensitivity of myofibrillar adenosine triphosphatase are used to differentiate avian skeletal muscle fibers as either fast or slow. pars thoracica m. pectoralis (pm) of several avian species, pars cranialis m. latissimi dorsi (ldcr) of the japanese quail, and m. tensor propatagialis (tp) of the domestic pigeon are examined. fast fibers predominate in the pm, and slow fibers in the ldcr. the tp shows marked internal variation in the distribution of muscl ... | 1987 | 2951958 |
| immunocytochemical markers revealing retinal and pineal but not hypothalamic photoreceptor systems in the japanese quail. | the retinal proteins opsin, alpha-transducin, s-antigen and interstitial retinol-binding protein (irbp) are essential for the processes of vision. by use of immunocytochemistry we have employed antibodies directed against these "photoreceptor proteins" in an attempt to identify the photoreceptor systems (retina, pineal and deep brain) of the japanese quail. opsin immunostaining was identified within many outer (basal portion) and inner segments of retinal photoreceptor cells and limited numbers ... | 1987 | 2952278 |
| quantification and characterization of metallothioneins in tissues of lower vertebrates and invertebrates. | metallothionein (mt) and the related metal-binding proteins in tissues of lower vertebrates and invertebrates were isolated by gel filtration chromatography (conventional liquid and high performance liquid chromatography). the metal-binding proteins including mt were detected by determining the metals bound to the proteins by atomic absorption spectrophotometry. this analytical procedure was recommendable as the first step to characterize unknown metal-binding proteins in diverse living bodies. ... | 1987 | 2959515 |
| does a biological clock reside in the eye of quail? | the site (intra- vs. extraocular) of the circadian clock driving an ocular melatonin rhythm in japanese quail was investigated by alternately covering the left and right eyes of individual quail, otherwise held in constant light (ll), for 12-hr periods. this procedure exposed each eye to a light-dark (ld) 12:12 light cycle 180 degrees (12 hr) out of phase with the ld 12:12 light cycle experienced by the other eye. this protocol entrained the melatonin rhythm in the left eye of quail 180 degrees ... | 1988 | 2979642 |
| rapid photoperiodic responses in japanese quail: is daylength measurement based upon a circadian system? | experimental photoperiods, presented either once only or repeatedly, were used to assess the oscillatory and hourglass properties of the photoperiodic clock in japanese quail. gonadectomized quail on 8-hr daylengths respond to a single skeleton photoperiod consisting of two 8-hr light pulses separated by 2 hr of darkness (i.e., ldld 8:2:8:6) with a marked increase in secretion rate of luteinizing hormone (lh). this response suggests that the second light pulse interacts with a "photoinducible ph ... | 1987 | 2979655 |
| effects of supplementary vitamin d3 on egg production of two strains of japanese quail and growth of their progeny. | two strains (university of saskatchewan, white egg and wild type) of mature japanese quail (coturnix coturnix japonica), following a 4-week depletion period, were fed one of four diets varying in supplementary vitamin d3: a) no supplementary vitamin d3, b) national research council (nrc, 1977) recommended level of 1,200 iu vitamin d3/kg feed, c) 10 times, nrc levels, and d) 100 times nrc levels for 4 weeks. egg production, egg weight, number of softshelled eggs, body weight, and feed consumption ... | 1985 | 2986086 |
| [susceptibility of birds other than chickens to infectious laryngotracheitis]. | susceptibility to infectious laryngotracheitis virus was studied in peafowl (pavo cristatus), various species of pheasant (phasianus colchicus, lophura swinhoeii, lophophorus impejanus), guinea-fowl (numida meleagris), canaries (serinus canaria), budgerigars (melopsittacus undulatus) and japanese quail (coturnix coturnic japonica). apart from clinical observations, experiments were evaluated in terms of histopathology, immunofluorescence, serology and recovery of virus. only peafowl and pheasant ... | 1985 | 2990066 |
| s13, a rapidly oncogenic replication-defective avian retrovirus. | the avian leukemia sarcoma virus s13 transforms chicken and japanese quail embryo fibroblasts and chicken erythroid cells in tissue culture. s13-induced erythroid transformation requires culture conditions suitable for the growth of normal erythroid precursors (h. beug and m. j. hayman (1984), cell 36, 963-972). s13-transformed erythroid colonies contain a high percentage of cells that differentiate in absence of erythropoietin. s13 is defective in pol and env functions but can code for a comple ... | 1985 | 2990096 |
| production of herpesvirus of turkeys in microcarrier culturing system--a new method for production of vaccine against marek's disease. | a microcarrier (mc) culturing system for production of a vaccine against marek's disease virus is presented. cytodex-3 beads (pharmacia) and de-53 microgranular (whatman) are the recommended microcarriers. primary cells from chick embryo as well as cells from a quail cell line (qt-6, established from a japanese quail) were found to be good hosts for growth of herpesvirus of turkeys (hvt). hvt, the vaccine strain against marek's disease, was successfully grown and harvested on the above mentioned ... | 1985 | 2995176 |
| marek's disease in japanese quails (coturnix coturnix japonica): a study of natural cases. | marek's disease was observed in quails. gross lesions were confined mostly to the spleen and liver. microscopic lesions were commonly seen in spleen, proventriculus, liver, and duodenum. skin, peripheral nerves, and other visceral organs were also involved. of 123 quails examined, 39 had serum antibodies against marek's disease. these antibodies were detected from 11 to 17 weeks of age; the highest incidence was recorded at 15 weeks. feather follicular antigen detected in 30 of the 95 quails was ... | 1985 | 3000332 |
| response of japanese quail fed seed meal from sunflowers grown on a municipal sludge-amended soil: elevation of cadmium in tissues. | sunflowers were grown on soil amended with 224 metric tons/ha of municipal sewage sludge from syracuse, n.y. the yield of sunflower seeds was reduced by 47.2% by the sludge addition. the harvested seeds contained 1.71 ppm dry weight of cadmium. deoiled seed meal was incorporated as 25 and 50% of semipurified diet and fed to male and female japanese quail. the concentrations of cadmium were higher in kidney, liver, muscle, and eggs of birds fed the sludge-grown seed meal as compared to control qu ... | 1986 | 3005604 |
| characterization of rous sarcoma virus-related sequences in the japanese quail. | we detected sequences related to the avian retrovirus rous sarcoma virus within the genome of the japanese quail, a species previously considered to be free of endogenous avian leukosis virus elements. using low-stringency conditions of hybridization, we screened a quail genomic library for clones containing retrovirus-related information. of five clones so selected, one, lambda q48, contained sequence information related to the gag, pol, and env genes of rous sarcoma virus arranged in a contigu ... | 1986 | 3016302 |
| molecular cloning and characterization of gag-, pol-, and env-related gene sequences in the ev- chicken. | using less stringent hybridization conditions and cloned viral dna probes representing the avian sarcoma virus gag, pol, env, and long terminal repeat (ltr) gene sequences, we detected related sequences in two avian species purportedly lacking all endogenous avian leukosis viruses, the ev- chicken and the japanese quail. the blot hybridization patterns obtained with the various probes suggest the presence of between 40 and 100 copies of retrovirus-related sequences in the genomes of these two sp ... | 1986 | 3016330 |
| interspecies selective motoneuron projection patterns in chick-quail chimeras. | during normal development chick motoneurons have been shown to project selectively to appropriate muscles by responding to a series of cues, both specific and nonspecific, within the limb. we tested the ability of motoneurons from another avian species, the japanese quail, to respond to these cues by transplanting chick limb buds onto quail embryos and quail limb buds onto chick embryos between stages 17 1/2 and 19. feulgen staining, which distinguishes chick from quail cells on the basis of nuc ... | 1986 | 3020186 |
| passage of duck hepatitis virus in cell cultures derived from avian embryos of different species. | an egg-attenuated strain of duck hepatitis virus was successfully passaged through cell cultures of avian embryos derived from goose, turkey, guinea fowl, japanese quail, pheasant and chicken. two field strains of the virus were passaged in a more limited range of species. | 1986 | 3020656 |
| infectious bursal disease virus infection in the quail-chicken hybrid. | hybrids produced from crossing cornell k-strain white leghorn chickens and line ii japanese quails were studied for susceptibility to infection with infectious bursal disease virus (ibdv). quail-chicken hybrids were infected successfully following inoculation with ibdv at 14, 21, or 52 days of age. in most cases, precipitating antibodies were detected in serum by 10 days postinoculation (pi). although no clinical signs or gross lesions were evident in the bursa of fabricius of hybrids, histologi ... | 1986 | 3021100 |
| ultrastructural and cytochemical studies in normal japanese quail (coturnix coturnix japonica) eosinophils and in those from birds with experimentally induced eosinophilia. | normal eosinophil development in the japanese quail (coturnix coturnix japonica) was similar to that described in the fowl and the duck, with granulogenesis occurring in the golgi apparatus. the characteristic lipid droplets were small in the immature eosinophils, and after staining specifically for lipid, small moieties were also traced to the golgi apparatus. in mature eosinophils the lipid droplets measured between 1.0 and 1.5 micron in diameter and they were surrounded by profiles of smooth ... | 1986 | 3022360 |
| vitamin d3 and avian bone in vitro: specificity of effect on japanese quail calvaria. | calcitriol (1,25(oh)2d3) has been shown, under certain conditions, to elicit an in vitro response in adult avian calvarium which may be interpreted as calcium uptake by the bone. the present investigation was undertaken to study the specificity of this response. calvaria were removed from 6-week-old female japanese quail and cultured for periods of up to 96 hours at 37 degrees c in 5% co2/95% air. 1,25(oh)2d3 induced a fall in the medium total and ionic calcium concentrations at both 48 hours an ... | 1986 | 3026593 |
| in vitro effect of prostaglandins on the accumulation of cyclic amp in the avian oviduct. | the effects of prostaglandins e1, e2, and f2 alpha (pge1, pge2, and pgf2 alpha, respectively) on cyclic amp production in tissue samples from the uterus (u), uterovaginal sphincter (uvs), and vagina (v) of regularly laying hens as well as the effects of pge2 and forskolin on u and v of japanese quail were studied. both pge1 and pge2 enhanced cyclic amp production in the hen oviductal segments, particularly in the v in a dose-related manner, pge1 being the more effective agonist. pgf2 alpha had n ... | 1987 | 3034716 |
| experimental studies on marek's disease in japanese quail (coturnix coturnix japonica). | day-old quails experimentally infected with marek's disease (md) virus of quail origin developed lymphoid tumors. the severity of the disease increased considerably with serial passage. tumor transplants could be made with cells derived from gross tumors in skeletal muscles, spleen cells, and blood from md-affected quails. after five to six serial transplants, the tumor could not be transplanted further. marek's disease tumor-associated surface antigen (matsa) was demonstrated in lymphoid cells ... | 1987 | 3039961 |
| immunocytochemical studies on the lhrh system of the japanese quail: influence by photoperiod and aspects of sexual differentiation. | immunocytochemistry was used to determine if photoperiod and/or sex have any effect on the pattern of the luteinizing hormone-releasing hormone (lhrh) system in the brain of the japanese quail. immunopositive perikarya were found within three major areas of the brain: the rostral paraolfactory lobe, the preoptic, and the septal region. a quantitative analysis of lhrh cell numbers was performed on male and female quail after two photoperiodic treatments: sexually mature birds exposed to 24 weeks ... | 1988 | 3044600 |
| induction of ovulation and oviposition in female quail with luteinizing hormone, luteinizing hormone releasing hormone, or progesterone. | regularly laying female japanese quail were injected 12 or 18 hr before the next expected oviposition with 25 micrograms olh, 25 micrograms luteinizing hormone releasing hormone (lhrh), or 0.05 mg progesterone, and the subsequent oviposition was recorded and ovulation determined by autopsy 9 hr after the injection. plasma progesterone levels were measured in blood collected from a wing vein during the postinjection interval. vehicle-injected birds served as control. all treatments resulted in pr ... | 2011 | 3044919 |
| embryonic vascular development: immunohistochemical identification of the origin and subsequent morphogenesis of the major vessel primordia in quail embryos. | the development of the embryonic vasculature is examined here using a monoclonal antibody, qh-1, capable of labelling the presumptive endothelial cells of japanese quail embryos. antibody labelling is first seen within the embryo proper at the 1-somite stage. scattered labelling of single cells appears ventral to the somites and at the lateral edges of the anterior intestinal portal. the dorsal aorta soon forms a continuous cord at the ventrolateral edge of the somites and continues into the hea ... | 1988 | 3048971 |
| experimental aspergillosis in japanese quails (coturnix coturnix japonica). clinical signs and haematological changes. | intratracheal inoculation of 2-week-old quail chicks with aspergillus fumigatus resulted in the development of clinical signs within 24 h of infection. these were characterized by anorexia, depression, accelerated respiration and gasping followed by death. the acute course of the disease lasted for 7-10 days followed by recovery in the surviving chicks. the overall mortality during a 6-week observation period was 20%. although the mean body weight of a. fumigatus infected quail chicks continued ... | 1988 | 3050527 |
| changes in pituitary responsiveness during the ovulatory cycle of the japanese quail, in vitro. | anterior pituitary glands from ovulating japanese quail (coturnix coturnix) were used to investigate variation in sensitivity to chicken luteinizing hormone-releasing hormone (clhrh i; gln8-lhrh). grouping the pituitaries by ovulatory stage provided preliminary evidence of changes in sensitivity to lhrh during the ovulatory cycle. pituitaries taken from quail before the preovulatory lh surge were responsive to clhrh i, while pituitaries from the other times of the cycle showed minimal response t ... | 1988 | 3053965 |
| sequential pathological studies in japanese quails infected experimentally with aspergillus fumigatus. | intratracheal inoculation of young quail chicks with aspergillus fumigatus spores resulted in the development of characteristic gross and microscopic lesions. the lesions were restricted to respiratory tract and there was no dissemination of infection to other tissues of the body. gross changes in lungs and air sacs were observed within 24 hours and continued up to 20 days while in trachea these were noticed from the 3rd to the 9th day post-infection. the lesions, in general, included congestion ... | 1988 | 3057379 |
| different mechanisms controlling fsh and lh release in japanese quail (coturnix coturnix japonica): evidence for an inherently spontaneous release and production of fsh. | plasma concentration of fsh and lh and their content in the adenohypophyses of japanese quail were estimated by homologous radioimmunoassays based on chicken hormones. the results consistently showed that the plasma concentration of fsh was slightly higher than that of lh, although the fsh content in the adenohypophysis was much lower than that of lh in immature, mature and acutely photostimulated quail. these results prompted experiments in vitro to determine whether the difference was intrinsi ... | 1986 | 3081675 |
| gonadal development and gonadotrophin secretion in the male vole (microtus agrestis) after an abrupt change in photoperiod. | male voles were reared from birth to age 28 days in 6l:18d. pairs of animals showing similar sexual development were assigned at random to 16l:8d or 6l:18d. treatments continued for a further 56 days. increase in the activity of the hypothalamo-hypophysial system occurred within 4 days of exposure to 16l:8d, as shown by significant elevation of plasma lh and fsh. pituitary lh did not increase until day 7, and pituitary fsh did not increase until day 21. after exposure to 16l:8d for 4 days, pitui ... | 2011 | 3084767 |
| diamine oxidase activity in japanese quail liver induced with aroclor 1254. | male adult quails were treated with a single intraperitoneal dose of aroclor 1254 mg/kg. the animals showed increases in hepatic weight and benzopyrene hydroxylase activity which were continuous up to 168 h after the treatment. at 96 h after treatment the activity of diamine oxidase (dao) in the microsomal fraction was significantly decreased whereas that of spermidine synthase seemed to increase. | 1986 | 3088927 |
| developmental study of alpha-glucosidases in japanese quails with acid maltase deficiency. | in japanese quails with late-onset acid maltase deficiency (amd), the activity of acid alpha-glucosidase was severely reduced to approximately 16% of the normal level from an embryonic age. the kinetic characteristics and inhibition by zn indicated that the residual activity was responsible for the intrinsic activity of acid alpha-glucosidase. however, in affected embryos, the glycogen content and other lysosomal enzyme activities were normal, despite the low acid alpha-glucosidase activity. in ... | 2014 | 3090432 |
| induction of acute renal porphyria in japanese quail by aroclor 1254. | 1986 | 3094542 | |
| vitamin d3 and avian bone in vitro: stimulation of calcium movement into japanese quail calvaria. | addition of 1,25 dihydroxyvitamin d3 (1,25(oh)2d3) to cultured neonatal mouse calvaria has consistently led to bone resorption as determined by an increase in medium calcium. no such effect on avian bone has been widely reported. we have tested the in vitro effects of 1,25(oh)2d3 on 48- and 96-hour cultures of calvaria removed from both sexes of japanese quail at various ages. no effect of 1,25(oh)2d3 on net calcium movement was seen in cultures of calvaria removed from neonatal (5-day), 1-week, ... | 1986 | 3100004 |
| effects of two kinds of chicken luteinizing hormone-releasing hormone (lh-rh), mammalian lh-rh and its analogs on the release of lh and fsh in japanese quail and chicken. | a newly isolated and characterized chicken luteinizing hormone-releasing hormone-ii (chicken lh-rh-ii, miyamoto et al., 1984) had luteinizing hormone (lh) and follicle-stimulating hormone (fsh) releasing activity in vitro and in vivo in japanese quail: the activity was almost equal to chicken lh-rh-i and mammalian lh-rh. these three lh-rhs induced the release of lh several times higher than that of fsh in vitro and also in vivo. no significant difference between chicken lh-rh-i and lh-rh-ii was ... | 1986 | 3100386 |
| effects of polychlorinated biphenyls on porphyrin synthesis and cytochrome p-450-dependent monooxygenases in small intestine and liver of japanese quail. | the effects of acute exposure to polychlorinated biphenyls (pcbs) on porphyrin synthesis and cytochrome p-450-dependent monooxygenases in the small intestine and liver were studied in male japanese quail. the birds were dosed orally with the pcb mixture, aroclor 1242, or the individual pcb isomers, 2,4,2',4'-tetrachlorobiphenyl (2-tcb) and 3,4,3',4'-tetrachlorobiphenyl (3-tcb), and were killed 48 h later. all the pcb compounds caused a significant increase in porphyrin content and delta-aminolev ... | 2010 | 3100819 |
| [study of the submicroscopic structure of striated muscles in japanese quail under conditions of stress]. | an electronmicroscopic study of striated muscles was made in japanese quail stressed by hypokinesis. during 15-day hypokinesis influencing m. gastrocnemius, small pale vacuoles were found out on some mitochondria. the process of alterations went on, and in the 15-day hypokinetic animals, alterations in myofibrils were observed besides the alterations in mitochondria. they manifested themselves by indistinct lines of actin and myosin fibers and by an uneven course of z-lines. the alterations of m ... | 2011 | 3103310 |
| [the effect of dietary lysine excess and deficiency on metabolism in japanese quail]. | we conducted three experiments with japanese quail to study the influence of deficient and excessive contents of lysine in the feed in relation to certain zootechnical parameters, protein value, to the active of liver xanthine dehydrogenase, content of free plasma lysine under the conditions of the maximum saturation of blood pool, and to the changes in 14c-labelled lysine degradation. the zootechnical parameters and protein value were optimum at the content of 5.22 g lys per 16 g nitrogen in th ... | 1987 | 3109105 |
| acid maltase deficiency in the japanese quail; early morphological event in skeletal muscle. | the skeletal muscle of japanese quails with acid maltase deficiency (amd) was studied morphologically at various developmental stages, from the 16th embryonal day up to 3 months after hatching. membrane-bound glycogen particles began to appear in the affected skeletal muscle at the 16th embryonal day. in normal embryonic muscles, a certain amount of free glycogen particles was observed but they were not membrane-bound. therefore, this is the earliest morphological event in the muscle of japanese ... | 1987 | 3111161 |
| tissue distribution and hepatic ultrastructural effects of aflatoxin b1 in japanese quail. | fertile, japanese quail eggs were injected with graded levels of aflatoxin b1 (afb1) dissolved in ethanol. hatchability varied inversely with the quantity of afb1 administered. the generated quail were utilized in studies of afb1 distribution and its effects upon hepatic ultrastructure. putative afb1 was detected within the livers of two quail 6 h after dosing, although the afb1 distribution was inconsistent between the individuals. electron microscopy revealed that liver parenchymal cells from ... | 1986 | 3111516 |
| quantification of lysine dynamics in the japanese quail. | to cockerels of the japanese quail four graduated flooding doses of 14c-labelled l-lysine (20-160 mg) in starch gel were administered into the crop. the animals were slaughtered between 40 and 210 min thereafter. the tca soluble fraction of the gastrointestinal tract, of blood plasma, liver and muscle were analyzed for their lysine content and its specific radioactivity. incorporation of radioactivity into the tca insoluble fraction of the same organs was also followed. after quantification of l ... | 1987 | 3120671 |
| reappearance of embryonic neutral alpha-glucosidase isoenzyme in acid maltase-deficient muscle of japanese quail. | two neutral alpha-glucosidase isoenzymes were isolated from the muscle of japanese quails with late-onset acid maltase deficiency. one isoenzyme is predominantly expressed in embryonic muscle and the other in adult muscle. the time of switching from one to the other of these two neutral alpha-glucosidases was the same as in normal birds. the glycogen content in acid maltase-deficient muscle was not inversely proportional to the amount of embryonic neutral alpha-glucosidase. from the results, we ... | 2011 | 3129300 |
| refined crystal structure of streptomyces griseus trypsin at 1.7 a resolution. | streptomyces griseus trypsin (sgt) is a bacterial serine proteinase that is more homologous to mammalian than to other bacterial enzymes. the structure of sgt has been solved primarily by molecular replacement, though some low-resolution phase information was supplied by heavy-atom derivatives. the mammalian pancreatic serine proteinases bovine trypsin (bt) and alpha-chymotrypsin (cht) were used as molecular replacement models. because these proteins have low homology with sgt compared to the ma ... | 1988 | 3135412 |
| the propagation of avian viruses in a continuous cell line (qt35) of japanese quail origin. | seven of nine avian virus families tested (birnaviridae, coronaviridae, herpesviridae, paramyxoviridae, poxviridae, reoviridae, and retroviridae) were found to replicate in a quail fibroblast cell line, designated qt35, resulting in a cytopathic effect (cpe) visible with the naked eye or by low-power microscopy. in comparison, only one (paramyxoviridae) of seven mammalian virus families tested produced an observable cpe. cytopathic changes induced by examined viruses were round cell, syncytial, ... | 1988 | 3135794 |
| carbon-14-ochratoxin a distribution in the japanese quail (coturnix coturnix japonica) monitored by whole body autoradiography. | tissue distribution of the nephrotoxic mycotoxin ochratoxin a was characterized in laying japanese quail by whole body autoradiography and scintillation counting using 14c-labelled toxin. periodically for 8 days after one intravenous injection of 14 microci/bird, corresponding to 70 ng/g body weight, birds were killed, frozen, and sagittal sections of the whole body were placed on x-ray film. in general, the ochratoxin disappeared from the avian body rapidly. specific retention of radioactivity ... | 1988 | 3136448 |
| hepatic uroporphyrin accumulation and uroporphyrinogen decarboxylase activity in cultured chick-embryo hepatocytes and in japanese quail (coturnix coturnix japonica) and mice treated with polyhalogenated aromatic compounds. | the relationship between hepatic uroporphyrin accumulation and uroporphyrinogen decarboxylase (ec 4.1.1.37) activity was investigated in cultured chick-embryo hepatocytes, japanese quail (coturnix coturnix japonica) and mice that had been treated with polyhalogenated aromatic compounds. chick-embryo hepatocytes treated with 3,3',4,4'-tetrachlorobiphenyl accumulated uroporphyrin in a dose-dependent fashion without a detectable decrease in uroporphyrinogen decarboxylase activity when either pentac ... | 1988 | 3138981 |
| gene controlling a differentiation step in the quail melanocyte. | albino mutation in animals blocks pigmentation owing to a deficiency in tyrosinase, although it does not affect the differentiation of colorless melanocytes from the neural crest. in the albino japanese quail (al, sex-linked), it was demonstrated that morphologically normal melanocytes differentiated from neural crest cells in culture and that these cells contained unmelanized melanosomes as expected for the mutant cells. the mutant melanocytes, however, were shown to exhibit tyrosinase activity ... | 1987 | 3139348 |
| [the effects of the plant growth regulator 3-benzylbenzothiazolium bromide on growth processes in japanese quail]. | 2011 | 3142142 | |
| dihydrofolate reductase activity in the purkinje neuron populations of some non-mammalian vertebrates. | the intensity and distribution of histochemically demonstrable dihydrofolate reductase (fh2-r ec 1.5.1.3.) in unfixed cryostat sections was studied in purkinje neurons of adult vertebrates that have either simple neural circuits and cytoarchitectonics (ictalurus nebulosus, rana esculenta) or complex neural circuits and cytoarchitectonics (coturnix coturnix japonica), compared with the rat as a control. the reaction was generally undetectable in ictalurus nebulosus and in rana esculenta; with pos ... | 1988 | 3149438 |
| expression of the troponin complex genes: transcriptional coactivation during myoblast differentiation and independent control in heart and skeletal muscles. | we compared the developmental regulation of the three troponin genes that encode the proteins of the ca2+ regulatory complex in striated muscles of the japanese quail. nuclear run-on transcription and rna protection analyses showed that the fast skeletal troponin i, the fast skeletal troponin t, and the slow skeletal-cardiac troponin c genes were transcriptionally coactivated and that transcripts rapidly accumulated within 6 to 12 h after the initiation of myoblast differentiation. the fast-isof ... | 1988 | 3185544 |
| [effect of polygonum multiflorum on the life-span and lipid metabolism in senile japanese quails]. | 1988 | 3191547 | |
| [effect of magnesium sulfate on the reproduction of the measles virus in cell culture]. | magnesium sulphate in concentrations of 25-50 mm induced reproducible increase in titers of extracellular measles virus (by 0.5-2.0 1g tcd50/0.5 ml) in japanese quail embryo cells. mgso4 effect was observed with all methods of cell cultivation: stationary, roller, or on microcarriers. its effect was associated not with its stabilizing influence on the extracellular virus but rather with the stimulation of the synthesis of intracellular viral proteins. | 1988 | 3195145 |
| studies of fluid and spermatozoal transport in the extratesticular genital ducts of the japanese quail. | stereological studies of the spermatic ducts of the quail were carried out for comparison between different parts of the system and those of other species, and to provide a basis for future physiological studies. duct length, surface areas and volumes of various components of the ducts were determined. values were subsequently used to calculate net fluxes of fluid across the duct epithelium, spermatozoal velocity and the distribution of spermatozoa throughout the system. it was concluded that th ... | 1988 | 3198469 |
| conditioning of appetitive and consummatory sexual behavior in male japanese quail. | two different types of stimulus objects, a live female quail artificially adorned with bright orange feathers and an inanimate toy dog, served as conditioned stimuli. for subjects in experimental groups, the conditioned stimuli were presented shortly before access to a sexually receptive normal female quail. for subjects in control groups, exposure to the conditioned stimuli was unpaired with copulatory opportunity. subjects in the experimental but not in the control groups quickly came to appro ... | 1988 | 3209962 |
| synergistic effects of vitamin d metabolites. | the vitamin d3 metabolites 1 alpha,24r,25- and 1 alpha,25s,26-trihydroxy vitamin d3 and their combinations with 1 alpha,25-dihydroxy vitamin d3 were tested for antirachitic activity in rats, chicken and japanese quails. the trihydroxylated compounds were found to increase the activity of 1 alpha,25-dihydroxy vitamin d3. since this synergistic effect is restricted to calcium absorption and bone formation while bone calcium mobilization is unchanged, the combined administration might improve calci ... | 1988 | 3214133 |
| prevention of hypercholesterolemia and atherosclerosis in japanese quail by high intake of soy protein. | this study was undertaken to determine the influence of levels of soy protein on cholesterol metabolism and the development of atherosclerosis in japanese quail (coturnix coturnix japonica). quail were fed purified diets containing one of four levels (10, 20, 40 or 60%) of soy protein either with (atherogenic) or without (control) 0.5% cholesterol. results showed that higher proportions of protein (40 and 60%) in atherogenic diets had a preventive effect on the development of atherosclerosis in ... | 1988 | 3214472 |
| divergent selection for growth in japanese quail under split and complete nutritional environments. 2. water and feed intake patterns and abdominal fat and carcass lipid characteristics. | a study was conducted to investigate water and feed intake patterns, abdominal fat and carcass lipid levels, feed efficiency and growth in high (h) and low (l) body weight lines of japanese quail divergently selected under complete diet (cd) or split diet (sd) environments. birds under the sd environment could self-select from high-protein low-energy or low-protein high-energy diets. progeny from both the selected and control (c) lines were evaluated under the sd environment in generations 6 and ... | 1988 | 3217303 |
| ontogeny of architectural complexity in embryonic quail visceral arch muscles. | understanding the mechanisms of muscle pattern formation requires that the complete sequence of ontogenetic events be defined, particularly in the emergence of architectural complexity and in the spatial relations between muscles and skeletal elements. this analysis of visceral arch myogenesis in quail (coturnix coturnix japonica) embryos identifies the location of premuscle condensations and subsequent segregation of individual muscles, documents the initial orientation of myofibers and changes ... | 1988 | 3218618 |
| formation and changes of the subembryonic liquid from turned, unturned, and cultured japanese quail eggs. | japanese quail eggs belonging to the same flock of hens were incubated under different conditions: group 1 eggs were turned 3 times a day, group 2 eggs were left unturned, and group 3 eggs were cultured and left unturned. the results indicate that failure to turn eggs results in a delayed efflux of liquid and glucose from albumen and from the subembryonic liquid. furthermore, the major difference between unturned and cultured eggs was that in the first group the glucose levels and in the second ... | 1988 | 3219193 |
| relationship between throat feather-color pattern and photodependency of testicular function in the athens randombred control line of japanese quail. | the relationship between throat feather-color and testicular regression and recrudescence under short photoperiods of 6 hr light (l):18 h dark (d) was examined in the athens randombred control line of japanese quail. in contrast to earlier studies, no differences were found in testicular regression when quail with brick red, mixed red and white, central red surrounded by white, or all white throat feathers were shifted from a photoperiod of 16l:8d to one of 6l:18d. the cloacal protuberance areas ... | 1988 | 3222197 |
| roles of age, body weight and composition in the initiation of sexual maturation of japanese quail (coturnix coturnix japonica). | 1. the roles of chronological age, body weight and body composition in the initiation of sexual maturation of japanese quail (coturnix coturnix japonica) were investigated by imposing an inhibitory photoperiod (ip), and by the intramuscular injection of turkey growth hormone (gh) or antisera to turkey growth hormone (agh). 2. absence of sexual maturity in the ip treatment was accompanied by reduced testis and ovary-oviduct weights, and an increased breast muscle weight expressed as a proportion ... | 1988 | 3224292 |
| steroidogenic properties of isolated adrenocortical cells from japanese quail selected for high serum corticosterone response to immobilization. | the effect of selection for high stress response on adrenocortical function was examined by measuring the corticosterone response of adrenocortical cells isolated from random-bred japanese quail and quail selected for high serum corticosterone response to immobilization (high-stress). highly enriched adrenocortical cells were incubated with various concentrations of acth1-24 (acth), 8-bromo-cyclic amp (8br-camp) and pregnenolone for 2 hr. corticosterone production was measured by radioimmunoassa ... | 1988 | 3224523 |
| rapid adjustment of the pineal n-acetyltransferase rhythm to change from long to short photoperiod in the japanese quail (coturnix coturnix japonica). | the dynamics of adjusting the pineal n-acetyltransferase rhythm from long to short photoperiod was assessed in the japanese quail (coturnix coturnix japonica). the transition from ld 16:8 to ld 8:16 was accomplished by symmetrical prolongation of the dark period. in ld 16:8, the period of elevated nocturnal activity lasted approximately 7 hours. during the first prolonged night, the evening n-acetyltransferase rise advanced by almost 3 hours relative to the rise in ld 16:8 and occurred at the sa ... | 1988 | 3225739 |
| oviposition pattern of japanese quail following hypothalamic lesioning with super-absorbent polymer. | the functions of two hypothalamic areas in controlling the female reproductive cycle were investigated by the intracerebral injection of a new type of water-absorbent polymer of high capacity (super-absorbent polymer). after injection of a minute amount of the polymer into the brain tissue, bulging of the polymer produces a discrete lesion at the site of injection. two lines (t- and j-lines) of japanese quail were used; t-line, having a characteristic free-running oviposition pattern irrespectiv ... | 1988 | 3240852 |
| a possible role for the eyes in the photoperiodic response of quail. | the effects of blinding on the photoperiodic responses of male japanese quail were investigated by measuring plasma luteinizing-hormone (lh) concentrations in intact and castrated birds. blinded birds were still able to respond to short and long days with appropriate changes in lh levels, suggesting that the basic photoperiodic mechanisms do not require retinal photoreception. however, there were clear-cut differences between blinded and sighted birds with the lh levels being higher in blinded q ... | 1988 | 3240855 |
| morphological evaluation of the atherogenicity of corn oil, hydrogenated corn oil, and butter fat in quail. | the atherogenicity of corn oil, hydrogenated corn oil, and butter fat was studied using 57 fourty-day-old male japanese quails. the animals were fed one of the following diets: basal diet, basal diet with corn oil plus cholesterol, basal diet with hydrogenated corn oil plus cholesterol, or basal diet with butter fat plus cholesterol. each atherogenic diet contained 15% fat and 2% cholesterol. marked hypercholesterolemia developed in all fat-fed groups after 3 weeks or 3 months, but no significan ... | 1988 | 3244049 |
| water intake induced by water deprivation in the quail, coturnix coturnix japonica. | mechanisms inducing drinking after water deprivation, and mechanisms terminating drinking after rehydration, were investigated in the quail, coturnix coturnix japonica. 1. water intake was induced after 4 h of water deprivation, and the amount of water drunk increased in proportion to the period of water deprivation. drinking occurred immediately after deprivation. drinking occurred immediately after deprived birds were given access to water, and continued for periods proportional to the period ... | 1988 | 3249018 |
| [immunohistochemical and ultrastructural study of aortic lesions in fat-fed quails]. | a total of 13 forty-day-old male japanese quails had free access to a atherogenic diet containing 15% corn oil and 2% cholesterol or commercial basal diet for 3 months. birds fed basal diet showed no significant intimal lesions. these birds had two types of cells, i.e. smooth muscle cell and fibroblast-like cell, in the tunica media of the ascending aorta. while fat-fed birds showed marked lipid-rich intimal lesions in the ascending aorta but not in the abdominal aorta. some macrophage-derived f ... | 1988 | 3260871 |
| effect of hypophysectomy on 17 alpha-hydroxylase activity in theca cells of the ovarian follicle in the japanese quail. | the activity of 17 alpha-hydroxylase, a key enzyme for progesterone metabolism in avian follicles, was measured in cell-free homogenates of isolated theca cells of japanese quail. kinetic studies revealed that differences in enzyme activity in the largest and the second largest follicles were mainly due to differences in vmax values. in order to investigate the mechanism of regulation of 17 alpha-hydroxylase activity, quail were hypophysectomized at various time periods during the ovulatory cycl ... | 1988 | 3266329 |
| method of modeling protein structure by the two-dimensional nuclear magnetic resonance spectroscopy data; application to the proteinase inhibitor busi iia from bull seminal plasma. | a new approach is suggested to model the spatial structure of protein molecules in solution based on combined use of the methods of theoretical conformational analysis and nmr spectroscopy data. at the first stage, special means are used to convert d connectivity information into the most probable values of dihedral angles. this allows search for possible spatial structures in the limited regions of the conformational space at further stages using the methods of the theoretical conformational an ... | 1988 | 3271489 |
| localization of avian lhrh-immunoreactive neurons in the hypothalamus of the domestic fowl, gallus domesticus, and the japanese quail, coturnix coturnix. | the localization of lhrh-containing perikarya and nerve fibers in the hypothalami of the domestic fowl and japanese quail was investigated by means of the specific immunoperoxidase abc method, using antisera against chicken lhrh-i ([gln8]-lhrh), chicken gnrh-ii ([his5-trp7-tyr8]-lhrh[2-10]) and mammalian lhrh ([arg8]-lhrh). chicken lhrh-i-immunoreactive perikarya were sparsely scattered in the nucleus preopticus periventricularis (pop), nucleus filiformis (fil) and nucleus septalis medialis (sm) ... | 1988 | 3277716 |
| the effects of estrogen, insulin and dexamethasone on the synthesis and secretion of egg white proteins in primary cultured oviduct cells of laying japanese quail (coturnix coturnix japonica). | 1. the effects of estrogen, insulin and dexamethasone on the synthesis of egg white proteins were investigated by employing primary cultured oviduct cells of laying japanese quails. 2. it was demonstrated that oviduct cells require insulin and dexamethasone, besides estrogen, to synthesize and secrete egg white proteins maximally. | 1988 | 3281790 |
| epithelial and neuronal calbindin in avian intestine. an immunohistochemical study. | it is well known that calbindin immunoreactivity is highly concentrated in the duodenal absorptive cells of young birds. we have shown that in the adult intestine of three avian species, calbindin content is much more variable. in addition to absorptive cells, we have detected throughout the gut of both sexes of the domestic fowl and in the large intestine of the japanese quail a second type of calbindin-positive epithelial cell which has the shape of a typical endocrine cell. these cells were p ... | 1988 | 3284652 |
| mc29 deletion mutants which fail to transform chicken macrophages are competent for transformation of quail macrophages. | a number of mc29 mutants with deleted myc genes have been previously characterized. many of these mutants have been found to be defective for transformation of chicken macrophages in vitro and for tumor induction in chickens. such mutants are capable of transforming japanese quail macrophages in vitro and inducing a high incidence of tumors in japanese quail. thus, japanese quail may contain a factor(s) capable of complementing the defective transforming proteins encoded by some deleted v-myc ge ... | 1987 | 3295297 |
| comparative thyroid development in precocial japanese quail and altricial ring doves. | the patterns of thyroid development in precocial japanese quail and altricial ring doves are described and compared. thyroid development can be divided into two phases: the first is characterized by increasing functional capacity of the thyroid gland but low circulating concentrations of thyroid hormones; during the second phase there are further increases in thyroid gland activity as well as a shift toward much higher levels of thyroid activity in the periphery. in japanese quail, the first pha ... | 1987 | 3298534 |
| luteinizing hormone secretion from the quail pituitary in vitro. | an enzymatically dispersed pituitary preparation from japanese quail (coturnix coturnix) was used to study the dynamics of gonadotropin release. after an 18-h incubation, the cells were challenged with different luteinizing hormone-releasing hormones (lhrh) for 90 min. using pituitary cells from mature males, mammalian and chicken lhrh i (gln8-lhrh) had approximately equal luteinizing hormone (lh)-releasing activity whereas chicken lhrh ii (his5, trp7, tyr8-lhrh) was 8-9 times more potent. the l ... | 1987 | 3304437 |
| changes in gonadotrophin-releasing hormone and lh in japanese quail during the first few days of photostimulation. | castrated japanese quail responded to a single long day with a five- to eightfold increase in plasma lh levels. a rise in lh secretion appeared 19-24 h after dawn and lh levels were still increased 3 days later, despite the fact that the birds had been returned to a short daylength. pituitary lh content decreased, reflecting these changes in secretion, although significant falls in content were only found 36-96 h after dawn, when lh secretion was maximal. hypothalamic gonadotrophin-releasing hor ... | 1987 | 3305758 |
| steroids modulate the release of luteinizing hormone from quail pituitary cells. | an enzymatically dispersed pituitary preparation from male japanese quail (coturnix coturnix) was used to study the effects of gonadal and adrenal steroids on gonadotropin release. cells were preincubated for 18 hr with or without steroids and then challenged with chicken luteinizing hormone-releasing hormone (clh-rh i; gln8-lh-rh). preincubation with testosterone (t; 10 nm) significantly suppressed (p less than 0.05) luteinizing hormone release in response to clh-rh i (10 ng/ml). preincubation ... | 1987 | 3325334 |
| interaction of surgical deafening and photoperiod on cloacal gland and testes size in japanese quail. | two experiments were conducted to further examine the interaction of social stimuli and photoperiod on cloacal and gonadal responses in male japanese quail. in experiment 1, adult males kept on a maximal (15l:9d) stimulatory photoperiod were surgically deafened and/or visually isolated from roommates. after 6 weeks, there were no differences in cloacal gland or testes size among visually isolated birds, deafened birds, visually isolated and deafened birds, and control birds. it would appear that ... | 1988 | 3360300 |
| changes in plasma concentrations of reproductive steroids in female japanese quail (coturnix coturnix japonica) raised on long or short photoperiods. | plasma concentrations of progesterone, testosterone, estradiol, and estrone were measured by radioimmunoassay in female japanese quail 22 to 70 days of age. the birds were raised on long (16 hr light per day) or short (8 hr light per day) photoperiods. only the birds raised on the long photoperiod layed eggs, starting between 42 and 49 days of age. the concentration of each reproductive steroid increased between 28 and 35 days of age, but the increases were more substantial in the birds raised o ... | 1988 | 3366353 |
| profiles of plasma androgens in quail following testosterone injection at two different times of day. | adult castrated male japanese quail (coturnix japonica) housed on an 8l:16d light-dark cycle (lights on at 0700 hr) were given a single injection of either 100 or 500 micrograms testosterone (t) at either 0800 or 1430 hr. blood samples were taken 1, 3, 5, 7, or 24 hr after injection and assayed for androgens. additional samples were taken from intact males housed on a 16l:8d light-dark cycle and from castrated males housed on 8l:16d and injected with the oil vehicle. with the 100-micrograms dosa ... | 1988 | 3366357 |
| mechanism controlling photostimulated luteinizing hormone secretion is different from preovulatory luteinizing hormone surge in japanese quail (coturnix coturnix japonica). | a so-called "night-interruption" experiment with a 15-min light pulse showed that a sensitive phase for the photoperiodic lh secretion in male japanese quail extended over a period of 2 hr from 12.5 to 14.5 hr after dawn. exposure of a 1-hr light pulse at this photosensitive phase to male quail kept under 8l:16d induced the increase of plasma lh concentrations just the same as quail transferred to 16l:8d. in the first few days of photostimulation either by night interruption or by long days, lh ... | 1988 | 3371646 |