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Male Japanese quail were raised under 14-hr (5:00-19:00) light per day for 4 months from the day of hatch, and their gonadotropic activities of the anterior lobes of pituitary at various times during a 24-hr period were measured using a bioassay method based on 32P-uptake by chick testes. A peak of the gonadotropic activity was found at the end of light period. When the time of onset of light was shifted from 5:00 to 17:00 and the birds were kept for 2 weeks, the peak shifted to a time close to the end of the new light period. When the length of the light period was reduced to 8 hours and the birds were kept for 16 weeks, the peak disappeared.

Effect of Changing Photoperiods on the Diurnal Rhythm of Pituitary Gonadotropic Activity of Mature Male Japanese Quail