Showing papers on "Coturnix published in 1969"
TL;DR: There is now good evidence available to support Bünning's hypothesis in plants, and in at least four species of finches where the photoperiodic induction of testicular growth also relies on a circadian rhythm.
Abstract: IN 1936 Bunning1,2 suggested that living organisms measured the length of the daily photoperiod by using an endogenous daily (circadian) rhythm which he envisaged as consisting of two half-cycles (the photophil followed by the scotophil) each of approximately 12 h duration2. Photoperiodic induction of a physiological process requiring long days occurred only when the duration of the natural photoperiod extended into the scotophil part of the endogenous cycle. A more explicit version of the Bunning hypothesis has been presented by Pittendrigh3,4, stressing the dual function of light in acting both as an entraining agent (or Zeitgeber) for the circadian oscillation and as the photoperiodic inducer. He has also emphasized that the “scotophil” may not last for a full 12 h and suggests the more restrictive term “photo-inducible phase” to refer to that portion of the daily oscillation which, if illuminated, leads to photoperiodic induction. There is now good evidence available to support Bunning's hypothesis in plants5,6, and in at least four species of finches where the photoperiodic induction of testicular growth also relies on a circadian rhythm7–16. The present studies in a Galliform species, the Japanese quail (Coturnix coturnix japonica)17–20, were undertaken not only to check whether a circadian oscillator was involved in the photo-periodic response mechanism of both sexes but also to measure the duration of the photo-inducible phase. Experiments on the latter seemed possible, for Coturnix shows an extremely high rate of gonadal development18.
201 citations
TL;DR: The breeding condition of the males was never insensitive to long days, suggesting that adult male coturnix are nonphotorefractory, and TP-induced regression of the testes was reversible by withdrawing the hormone and shifting the males to long photoperiods.
109 citations
Book•
30 Dec 1969
TL;DR: This online broadcast the coturnix quail anatomy and histology can be one of the options to accompany you similar to having extra time.
Abstract: Getting the books the coturnix quail anatomy and histology now is not type of challenging means. You could not forlorn going in the manner of book amassing or library or borrowing from your links to way in them. This is an categorically simple means to specifically get guide by on-line. This online broadcast the coturnix quail anatomy and histology can be one of the options to accompany you similar to having extra time.
86 citations
TL;DR: Mechanisms to reduce negative heterosis include null alleles, deletions, X-linkage, Lyon effect, epistasis, supergenes and inbreeding—and speciation.
35 citations
TL;DR: Hoffman and Reiter recently showed that pinealectomy prevented the usual atrophy of the testes of adult hamsters kept under daily photoperiods consisting of one hour of light and 23 hours of darkness for a period of 4 weeks.
15 citations
Journal Article•
8 citations
TL;DR: The present study analyzes the translocations of albumen in this species and compares them with the conditions found in some other species of birds.
6 citations
TL;DR: The transbuccal approach of Hill and Parkes (1934) has proven to be a rapid and reliable method for hypophysectomy in Japanese quail and beginning operators report a variety of unexpected problems, including difficulty in restraining Coturnix for anesthesia and in making the necessary modifications.
5 citations
TL;DR: This report evaluates regimens involving four brooding temperatures and three humidity levels used in brooding coturnix for the first four weeks, in bioclimate chambers.
1 citations