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The Effects of Progesterone upon Ovarian Function in Gilts¹

University of Wisconsin

Abstract

Forty-three gilts were used in studying the effects of four different dosages of progesterone upon ovarian function (12.5, 25.0, 50.0, and 100.0 mg. per day). The lower dosage had no apparent effect. The three higher dosages were capable of inhibiting heat and ovulation during treatment when injections were started early enough in the estrual cycle. However, post-treatment ovulation was consistently complete (all larger follicles ovulated) only when 100 mg. daily injections were made. A high percentage of the ovaries in gilts receiving 50 mg. daily became cystic. These animals showed no heat during observation periods of 7 to 26 days post-treatment.

The theory is advanced that progesterone blocks the gonadotrophic complex, perhaps chiefly LH from interacting with FSH upon the ovary. Partial inhibition may bring about an imbalance of interacting gonadotrophic hormones which produces cystic follicles.

¹ Published with the approval of the Wisconsin Agricultural Experiment Station. Paper from the Department of Genetics No. 455 and from the Department of Animal Husbandry.

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				P. S. Henshaw Physiologic Control of Fertility Science, May 29, 1953; 117(3048): 572 - 582. [PDF]