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  • Title: Sexual differentiation of the photoperiodic response in Japanese quail.
    Author: Urbanski HF, Follett BK.
    Journal: J Endocrinol; 1982 Feb; 92(2):279-82. PubMed ID: 7061952.
    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.
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