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The Effect of Progesterone on Ovulation Time in Dairy Heifers

Department of Animal Husbandry, Cornell University, Ithaca, N. Y.

ABSTRACT

The subcutaneous injection of small doses (5 to 10 mg.) of progesterone at the beginning of estrus hastens the ovulatory process in dairy heifers. Both the length of estrus and the time from end of estrus to ovulation are significantly reduced. These results and histological changes occurring in the ovary at estrus suggest that progesterone produced by the ovary before ovulation normally plays a role in luteinizing hormone release and ovulation in the cow. These facts may be significant in an understanding of the deranged physiology of the nymphomaniac cow and in other types of infertility in farm animals.