Abstract
In 1929, Fee and Parkes reported that removal of the female rabbit’s pituitary by decerebration less than 1 hour after mating inhibited the ovulation which would otherwise take place 10 to 12 hours later. If, however, the time between mating and hypophysectomy exceeded 1 hour, ovulation followed within the normal interval. This work has since been confirmed by Smith and White (2). In 1934, Hill (3) demonstrated that the gonadotropic potency of the anterior hypophysis changed abruptly after mating. He found that the anterior pituitary gland of the average normal doe in heat contained 1560 rabbit-ovulating units of gonadotropic substance. One-half hour postcoitum, the gonadotropic potency of the pituitary fell to 1220 u (a 20 per cent decrease) ; and within 24 hours postcoitum the value had further fallen to 210 u (a decrease in potency of approximately 87 per cent). One may conclude from these data that rapid functional changes take place in the anterior hypophysis within the first few hours after mating, viz., that within 1 to 2 hours postcoitum the blood stream receives enough gonadotropic hormone from the anterior pituitary to induce ovulation.
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