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Effects of Diethylstilbestrol Dipropionate upon Postpartum Changes in the Cow¹

University of Wisconsin

Abstract

The effects of diethylstilbestrol dipropionate upon postpartum changes in the genital organs and upon subsequent breeding efficiency has been studied in 60 purebred Holstein cows. Injection of 20 mg. of the hormone within 9 hours after calving failed to produce a demonstrable effect on the intervals from calving until (1) involution of the uterus (2) first succeeding ovulation, or (3) first succeeding estrus. No effect of treatment was shown upon the occurrence of cystic ovaries or the percentage of cows conceiving upon first service. Ovulation, on the average over all cows, occurred 25.4 days earlier than the first postpartum estrus; 68 percent of the cows showed at least one "quiet" ovulation before the first estrus. Older cows (fourth and later calving intervals) tended to show longer intervals from parturition to estrus and to ovulation than did younger cows.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. Paper from the Department of Genetics (No. 413) and from the Department of Veterinary Science.