Showing papers on "Coturnix published in 1973"
TL;DR: Whether the effects of handling were stimulatory, inhibitory, or of no effect depended on the time of the disturbance with respect to a daily 16-hour photoperiod.
Abstract: Handling disturbances alone repeated daily for ten days caused marked changes in the fat stores of a fish, Fundulus chrysotus, a lizard, Anolis carolinensis, a quail, Coturnix c. japonica, and a mouse, Mus musculus. Repeated handling also caused changes in the weights of the male reproductive organs in the lizard and mouse. Whether the effects of handling were stimulatory, inhibitory, or of no effect depended on the time of the disturbance with respect to a daily 16-hour photoperiod. The results should serve as a warning to investigators in many areas in which experimental subjects are handled in one way or another at the same time each day.
48 citations
TL;DR: Dietary aflatoxins fed to 72 day old laying Japanese quail for six weeks at low levels of 2, 4, or 6 μg./gm.
42 citations
TL;DR: Coturnix quail exposed to Aspergillus fumigatus spores at hatching suffered significantly greater mortality from the ensuing disease than did chickens or turkeys exposed at the same time.
32 citations
TL;DR: Mating activity was at its maximum between 70 and 210 days of age, after which it began to decline, and this age pattern is consistent with that for general fertility of Japanese quail.
28 citations
TL;DR: Continuity in the various developmental stages of the oocytes in the adult laying Japanese quail may be demonstrated with a method of whole stock labelling of their nuclei by successive applications of [ 3 H]thymidine during their premeiotic period.
Abstract: SUMMARY Continuity in the various developmental stages of the oocytes in the adult laying Japanese quail may be demonstrated with a method of whole stock labelling of their nuclei by successive applications of [ 3 H]thymidine during their premeiotic period. Before they mature, the intraovarian oocytes of the adult Japanese quail go through three important successive stages. In each of these stages the chromosomes have a distinct morphology and cytochemical behaviour. During the first stage or prelampbrush chromosome stage, the chromosomes are Feulgen-positive or green after Unna, and on the autoradiographs show intense incorporation of [ 3 H]uridine after injection of this RNA precursor into the animal. During the beginning of this period, which is of very variable duration, the oocyte seems to be in a state of structural stability. The most prominent feature found in the ooplasm of oocytes at this stage is the very large paranuclear Balbiani yolk-body complex, which can be found labelled after injection of [ 3 H]thymidine into the animal. During the second stage or lampbrush chromosome stage, the Feulgen nuclear reaction in the chromosomes weakens or becomes negative and the paranuclear Balbiani yolk-body complex disappears. After Unna, the lampbrush chromosomes and their lateral loops are seen to be pyroninophilic. On the autoradiographs after intraperitoneal injection of [ 3 H]uridine rapid and intense RNase-sensitive incorporation of this precursor over the chromosomes and nucleoplasm may be noted. During this stage there is thus both cytochemical and autoradiographic evidence for RNA synthesis in the rapidly enlarging germinal vesicle. During the third or postlampbrush stage activity in the germinal vesicle sharply decreases; the volume of the germinal vesicle no longer increases, the very contracted chromosomes are present in the form of Feulgenpositive vacuolized central spherules, and, after intraperitoneal injection of [ 3 H]uridine into the adult laying quail, incorporation cannot be demonstrated in the chromosomes. By contrast, the fundamental part of the ooplasm derived from the cortex, at that moment shows both cytochemical and autoradiographic evidence of the presence and/or synthesis of nucleic acids. The postlampbrush stage is a characteristic feature of non-mature oocytes with a germinal disc and can only be found in regularly laying Japanese quails exposed to full daytime or continuous illumination. 1 Author's address: Laboratory of Anatomy & Embryology, Rijksuniversitair Centrum, Groenenborgerlaan, 171, 2020-Antwerp, Belgium.
27 citations
01 Jan 1973
25 citations
TL;DR: Japanese quail were evaluated as laboratory animals for use in atherosclerosis research by measuring plasma cholesterol along with macroscopic examination of the large arteries for atheromatous lesions to identify early stage arterial damage.
24 citations
TL;DR: When eighty families were exposed by contact to CR64 strain of acute Marek's disease virus (M.D.V.), IS families exhibited no lesions while all of the offspring in 3 families were affected.
20 citations
TL;DR: Ovarian follicular development in a line of quail selected for increased 4-week body weight was compared to a control line and egg weight and yolk weight were greater in the larger bodied (P line) than in the smaller (C line) birds.
19 citations
TL;DR: Body weight, thyroid weight and thyroidal radioiodine (131 I) uptake were evaluated with respect to 3 lines of Japanese quail in response to 3 different dietary goitrogens, finding the existence of a compensating mechanism active in mitigating the goitrogenic effects of both thiouracil and sulfaguanidine is discussed.
15 citations
TL;DR: Findings in this study support previous findings that Hg does reduce the reproductive potential of the female of avian species and suggest that the loss of reproductive efficiency which is caused by Hg in both male and female quail may be correlated directly to a diminution in their normal mating behavior.
Abstract: SummaryThe results of this study support previous findings that Hg does reduce the reproductive potential of the female of avian species (3, 4). Additionally, the dangers of Hg are not relegated entirely to the female, but rather it is concluded that Hg exerts an equally adverse effect on the reproductive potential of the avian male. The loss of reproductive efficiency which is caused by Hg in both male and female quail may be correlated directly to a diminution in their normal mating behavior.
TL;DR: The survival time of erythrocytes labelled in vivo with diisopropyl phosphorofluoridate-32 P was determined for adult male and female Japanese quail using a bremsstrahlung method and gave an estimate of the rate of loss of organically-bound 32 P from the quail.
TL;DR: Experiments showed that young Japanese quail required dietary choline for optimum growth and prevention of perosis, and methylaminoethanol was effective as a substitute for Dietary choline, while aminoethanol, betaine and carnitine were not.
TL;DR: It is concluded that ochratoxin A accounts for the majority of the toxic response elicited by the compounds in the chloroform extract of the cultures.
Journal Article•
TL;DR: Regression analysis of data from 2,815 fertile Coturnix eggs showed a very highly significant linear regression of hatchability on shape index, with values fitting the regressed hatchability estimates very closely.
Journal Article•
Journal Article•
TL;DR: Both normal and dystrophic chickens and pheasants were found to excrete approximately the same percentage of the administered dose in the form of ornithuric acid while coturnix excreted significantly less in the forms of this metabolite.
TL;DR: The results suggest that short-term genetic progress for PCV in quail is best achieved by selection under the environment which allows the full expression of the character under selection.