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Effects of Feeding Diethylstilbestrol on the Development and Reproductive Performance of Dairy Cattle

Departments of Dairying and Physiology, Oklahoma State University, Stillwater

ABSTRACT

The effects of continuous feeding of diethylstilbestrol (DES) on the development and reproductive performance of dairy cattle were determined.

Heifers fed DES starting at four months of age made more rapid weight gains (P < 0.05) to 15 months of age than controls; however, the difference between groups diminished thereafter. Differences in mammary gland development and height of tailhead were small and temporary in nature. DES feeding had no effect on the ability of the heifers to conceive and produce a normal calf.

There was some indication that reproduction was impaired in a few cows fed 15 mg DES daily starting 30 days postpartum; however, the results with mature cows where inconclusive.

¹ Present address: Pharmacology Department, Salsbury's Laboratories, Charles City, Iowa.