Showing papers on "Coturnix published in 1980"
49 citations
TL;DR: Genetic analysis of approach preferences for blue and red colors in 1-day-old, experientially naïve quail, at 12th through 14th generations of bidirectional genetic selection, implicate four to eight segregating units of inheritance.
Abstract: Genetic analysis of approach preferences for blue and red colors in 1-day-old, experientially naive quail, at 12th through 14th generations of bidirectional genetic selection, implicate four to eight segregating units of inheritance. Because the quails' initial approach choices are also readily modifiable by experience, these results point the way to studying the mediation of gene effects, environment effects, and gene-environment interactions in visually guided behaviors.
34 citations
TL;DR: The total protein requirement of laying Japanese quail was found to be slightly greater than 16% of the diet when quail were fed diets based on either casein and soybean meal alone or caseinand soybean Meal supplemented with essential amino acids and glutamic acid.
30 citations
TL;DR: It was concluded that Coturnix quail could be used as a pilot animal in abdominal fat research provided due caution was taken of the differences between the two species.
30 citations
TL;DR: The results indicate that the neuroendocrine regulation of photoperiodically induced gonadotrophin secretion in immature quail appears to be controlled by two discrete hypothalamic centres, the infundibular nuclear complex (i. n. c. or the po. r.) and the preoptic region (po. r).
Abstract: Reproduction in the Japanese quail (Coturnix coturnix japonica), as in many other species, is controlled by the length of the daily photoperiod. The present experiments have investigated the neuroendocrine regulation of both the photoperiodically induced 'tonic' gonadotrophin secretion, which causes the development and maintenance of the ovary, and the 'cyclic' surge release of luteinizing hormone (LH), which stimulates ovulation. Areas within the anterior and tuberal hypothalamus were destroyed by means of electrolytic lesions while a small knife was used to isolate, to various degrees, the tuberal hypothalamus. Information was obtained on the regulation of 'tonic' and 'cyclic' secretion of gonadotrophin by using immature and mature laying females, respectively. The results indicate that the neuroendocrine regulation of photoperiodically induced gonadotrophin secretion in immature quail appears to be controlled by two discrete hypothalamic centres, the infundibular nuclear complex (i.n.c.) and the preoptic region (po.r.). The supraoptic region (so.r.) appears to have no influence on photoperiodically induced ovarian development. Deafferentation reveals that afferents from the anterior hypothalamus enter the tuberal region in a diffuse manner from both anterior and lateral directions. As in the developing animals, destruction of either the i.n.c. or the po.r. in mature birds results in a complete block to 'tonic' gonadotrophin release and to regression of the ovaries. When the supraoptic region is destroyed, the 'cyclic' ovulatory surge of LH is blocked and a polyfollicular syndrome ensues in which the ovaries, still under the influence of 'tonic' gonadotrophin release, grow to a very large size, but no ovulation takes place. An intramuscular injection of progesterone stimulates a release of LH in both untreated mature females and in sham-operated females, but not in so.r.-lesioned birds. Priming these lesioned females with oestrogen and progesterone restores, in some birds, the ability to respond positively to progesterone stimulation.
28 citations
TL;DR: Japanese quail were maintained on a low vitamin E soybean meal diet for 35 weeks and dietary vitamin E (2 IU/kg diet) was inadequate to support normal reproduction.
20 citations
Journal Article•
TL;DR: It was concluded that the fate of CMR-I myoblasts is fusion to form myotubes, and the only region in which chick nuclei appeared at significantly greater frequency than in control tissue was the dorsal thigh muscle.
Abstract: A technique appropriate to investigation of the developmental fates of distinct embryonic cell types is described and the fate of a particular type of chick myoblast (CMR-I) examined. CMR-I myoblast clones are morphologically different from other chick myoblast clone types and can readily be identified in living cultures. After two weeks of culture CMR-I myoblast clones were collected, aggregated, and transplanted into the prospective dorsal thigh region of young quail embryos. After four days of growth, cells of the transplant-containing quail legs were grown as clones. Chick clones were located by Feulgen staining and identified as muscle or non-muscle and, if muscle, as CMR-I or not; 91% of the chick clones recovered from transplants were muscle clones, and of these 97% were CMR-I. It was concluded that CMR-I myoblasts do not undergo a change in differentiated state identifiable by clonal analysis. Other transplant-containing quail legs were fixed, sectioned, and Feulgen stained. The locations of chick nuclei were determined. The only region in which chick nuclei appeared at significantly greater frequency than in control tissue was the dorsal thigh muscle, the region into which the cloned chick cells were placed originally. Dorsal thigh multinucleated myotubes exhibited the highest percentage of chick nuclei of all tissues examined. It was concluded that the fate of CMR-I myoblasts is fusion to form myotubes.
19 citations
TL;DR: Quail bronchitis was confirmed by recovery of fowl adenovirus serotype 1 from 2 flocks of adult birds that were reared commercially for their eggs in the Republic of Singapore.
Abstract: SUMMARY Quail bronchitis was confirmed by recovery of fowl adenovirus serotype 1 from 2 flocks of adult birds (Coturnix coturnix japonica) that were reared commercially for their eggs in the Republic of Singapore. Both flocks were reported to have a fall in egg numbers of 10-15%. The main clinical signs were respiratory distress and soft-shelled and white eggs lacking shell pigmentation.
10 citations
TL;DR: Analysis of the enzymatic activities of lactate dehydrogenase, glutamic oxaloacetic transaminase, and creatine phosphokinase failed to reveal any statistically significant differences between the nonexposed controls and those groups exposed to either 5 or 20 mW/cm2.
Abstract: Although exposure to nonionizing electromagnetic radiation has been reported to cause a variety of systemic alterations during embryonic development, there are few reports of the induction of specific physiology or morphologic changes in the myocardium. This study was designed to examine the effects of microwave radiation on cardiogenesis in Japanese quail embryos exposed during the first eight days of development to 2.45-GHz continuous-wave microwaves at power densities of 5 or 20 mW/cm2. The specific absorption rates were 4.0 and 16.2 mW/g, respectively. The ambient temperature for each exposure was set to maintain the embryonated eggs at 37.5 degree C. This did not preclude thermal gradients in the irradiated embryos since microwaves may not uniformly absorbed. The test exposure levels did not induce changes in either the morphology of the embryonic heart or the ultrastructure of the myocardial cells. Analysis of the enzymatic activities of lactate dehydrogenase, glutamic oxaloacetic transaminase, and creatine phosphokinase failed to reveal any statistically significant differences between the nonexposed controls and those groups exposed to either 5 or 20 mW/cm2. The data indicate that 2.45-GHz microwave radiation at 5 or 20 mW/cm2 has no effect on the measured variables of the Japanese quail myocardium exposed during the first eight days of development.
8 citations
TL;DR: Coturnix quail chicks were hatched from randomly selected eggs and grown to adulthood and there was no difference (P greater than .05) between mated and unmated female quail for percentage fat and moisture content of breast muscle and skin and percentage fat content of thigh muscle.
8 citations
TL;DR: In the majority of eggs the respiratory pattern returned to normal within a period of 1 hr after the eggs were rewarmed, and in some of the eggs there was a notable increase in the amplitude of respiration during the earlier part of cooling and in each egg the frequency fell to minimum value by the end of cooling.
TL;DR: Findings suggest that Japanese quail are less responsive to ACTH-induced adrenal hyperfunction than chickens.
Journal Article•
TL;DR: Results indicated that increasing the sex ratio up to one male to three females per cage had no significant detrimental effect on reproductive parameters and resulted in greater overall efficiency.
TL;DR: It was concluded that the adrenals directly influence daily ovulations in Coturnix, exerting an effect on hormonal events leading to ovulation.