title: Sexual differentiation of the photoperiodic response in Japanese quail.
abstract: Plasma levels of LH are generally higher in male than in female quail. This dimorphism was found to persist in quail which had been through a breeding cycle and then gonadectomized. Under long daylengths (12 h light: 12 h darkness (12L: 12D) or 16L: 8D) ovariectomized quail had plasma levels of LH that were 55-70% of those seen in castrated birds. The difference was reduced after transfer to short days (8L: 16D) when LH concentrations fell to basal levels, but again became more pronounced when the quail were restimulated with long photoperiods. Thus, the photoperiodic response system is sexually differentiated.
mesh_terms: D000818:Animals; D002369:Castration; D003370:Coturnix / Q000502:physiology*; D005260:Female; D008027:Light; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010507:Periodicity; D011784:Quail / Q000502:physiology*; D012733:Sex Differentiation
chemical_list: D007986:Luteinizing Hormone