Circulating levels of luteinizing hormone and androgen in mature male Japanese quail over 24 hours.
Male Japanese quail on a 16 light:8 dark photoperiod (on at 0600 h) were sampled over 24 h to determine peripheral levels of the luteinizing hormone and testosterone. Six males were sampled (each animal sampled once) at each of 10 sampling periods that began at 0800 h and ended the next morning at 0800 h. Serum testosterone concentrations were greatest at 2000 h and decreased across the night (2200 to 0600 h) to reach a nadir at 0500 h; levels increased in the morning but fell again at 1700 h. Luteinizing hormone levels were more constant, with peaks at 1500 and 0200 h.
Ottinger
M A
MA
Department of Poultry Science, University of Maryland, College Park 20742.
Follett
B K
BK
D000818:Animals; D003370:Coturnix / Q000097:blood*; D008027:Light; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D010507:Periodicity; D011784:Quail / Q000097:blood*; D013739:Testosterone / Q000097:blood*
D013739:Testosterone; D007986:Luteinizing Hormone