Abstract
Twenty female quail were housed in continuous dark for 8 weeks. Fourteen females stopped laying eggs and were injected daily with estrogen ( N = 5), estrogen plus progesterone ( N = 5), or oil ( N = 4) for 8 days and tested for copulatory behavior on Days 3, 5, and 7 after the first injection. Hormone-treated Ss squatted and participated in successful coitus. Oil-injected females vigorously avoided the males' copulatory attempts. Hormone-treated Ss permitted fewer successful copulations than untreated egg-laying females. Body weight and the size of the cloacal opening increased in hormone-treated Ss. At autopsy the Ss in all treatment groups had a maximum ovarian follicle diameter < 0.1 cm, while all the egg-laying females had a maximum follicle diameter ⩾ 1.4 cm.
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