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Rate of testicular maturation, in relation to gonadotrophin and testosterone levels, in quail exposed to various artificial photoperiods and to natural daylengths.
Rates of testicular growth and plasma levels of FSH, LH and testosterone were determined in Japanese quail exposed to various fixed photoperiods (number of hours of light: number of hours of… Expand
Photoperiodically Driven Changes in Fos Expression within the Basal Tuberal Hypothalamus and Median Eminence of Japanese Quail
The rapid photoperiodic response in Japanese quail is so precise that it allows neural analyses of how photoperiodic information is transduced into an endocrine response. After transfer from short… Expand
The reciprocal switching of two thyroid hormone-activating and -inactivating enzyme genes is involved in the photoperiodic gonadal response of Japanese quail.
The molecular mechanisms underlying photoperiodic time measurement are not well understood in any organism. Relatively recently, however, it has become clear that thyroid hormones play an important… Expand
Rhodopsin-like sensitivity of extra-retinal photoreceptors mediating the photoperiodic response in quail
It has been known for some 50 years that birds use photoreceptors in or near the hypothalamus to mediate the photoperiodic responses that control seasonal breeding1. So far, however, attempts to… Expand
Photoperiodism in Japanese quail: the termination of seasonal breeding by photorefractoriness
The photoperiodic mechanisms underlying seasonal breeding in male Japanese quail change their characteristics annually, with the result that reproduction is terminated in the late summer rather than… Expand
Plasma levels of luteinizing hormone and androgens in relation to age and breeding status among cooperatively breeding Australian magpies (Gymnorhina tibicen Latham).
- L. Schmidt, S. Bradshaw, B. Follett
- Biology, Medicine
- General and comparative endocrinology
- 1 July 1991
Plasma levels of luteinizing hormone (LH), testosterone (T), and 5 alpha-dihydrotestosterone (DHT) were measured in relation to age and social/breeding status among free-living male Australian… Expand
A radioimmunoassay for avian luteinizing hormone.
Influences of thyroidectomy and thyroxine replacement on photoperiodically controlled reproduction in quail.
The breeding season in quail ends when they become relatively refractory to long photoperiods. The processes underlying the development of this refractoriness are dependent upon the thyroid gland.… Expand
The hypothalamic photoreceptors regulating seasonal reproduction in birds: A prime role for VA opsin
- J. García-Fernández, R. Cernuda-Cernuda, +8 authors R. Foster
- Biology, Medicine
- Frontiers in Neuroendocrinology
- 1 April 2015
Extraretinal photoreceptors located within the medio-basal hypothalamus regulate the photoperiodic control of seasonal reproduction in birds. An action spectrum for this response describes an opsin… Expand
Annual Gonadal Cycles and Pituitary Gonadotropins in Zonotrichia leucophrys gambelii
The essential role of the anterior pituitary gland in the development and the function of the avian gonad has been recognized for more than three decades. However, little is known concerning annual… Expand