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Levels and Isomers of Diethylstilbestrol for Finishing Steers^{1, 2,}

Ohio Agricultural Research and Development Center, Wooster 44691³

Abstract

Fifty-eight steer calves were used to evaluate the level (0, 10, 20 and 40 mg/steer/day) and form (trans and cis isomers) of DES when orally fed. The maximum response in gain, feed intake, feed efficiency and carcass weight was observed when 20 mg of trans DES was fed daily. It is concluded that the cis isomer is ineffective for this purpose. Most carcass traits were unaffected by DES feeding. Seminal vesicle gland weights were increased by DES and this stimulation appeared to be related to the level of trans DES intake.

¹ Approved as Journal Article No. 104-70 by the Associate Director of the Ohio Agricultural Research and Development Center. Wonster.

² The assistance of H. Uhler, E. Meyers and J. Ford in the husbandry of the cattle is gratefully acknowledged. Dr. R. Weaver assisted in the statistical analyses of the data.

³ Department of Animal Science. Supported in part by Eli Lilly and Co., Greenfield, Indiana.