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 hormone content was not altered. One interpretation of this is that increased synthesis of the peptide compensates fully for the increased secretion.
Creighton
J A
JA
Follett
B K
BK
D000818:Animals; D003370:Coturnix / Q000502:physiology*; D007031:Hypothalamus / Q000378:metabolism; D008027:Light; D007986:Luteinizing Hormone / Q000378:metabolism*; D008297:Male; D009919:Orchiectomy; D010902:Pituitary Gland / Q000378:metabolism; D010906:Pituitary Hormone-Releasing Hormones / Q000378:metabolism*; D011784:Quail / Q000502:physiology*; D013997:Time Factors
D010906:Pituitary Hormone-Releasing Hormones; D007986:Luteinizing Hormone