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Effect of Stilbestrol, Progesterone-Estradiol Implants and Oral Administration of Stilbestrol on Fattening Lambs¹

Minnesota Agricultural Experiment Station

Abstract

Fattening lambs treated with implants of either a mixture of progesterone and estradiol, "Synovex," or stilbestrol gained significantly faster than the control lambs (.09 and .13 lb. per lamb daily, respectively). Feeding stilbestrol at either .1 mg., .5 mg. or 1.5 mg. per lamb daily did not significantly increase rate of gain. Carcass grade and yield of lambs implanted with Synovex were equal to the control lambs. However, the stilbestrol implant lowered both carcass grade and yield. The lambs that were fed .1 mg. and .5 mg. of stilbestrol produced higher grading carcasses than the controls. Lambs fed 1.5 mg. of stilbestrol produced carcasses of comparable quality to the controls. The carcass yield based on selling weight of the live lamb and warm carcass weights was lower in all lots fed stilbestrol.

¹ Paper No. 3345, Scientific Journal Series, St. Paul.

² Stilbestrol feed supplement was donated by Eli Lilly and Company through the courtesy of Dr. J. F. Downing and the hormone implants were donated by Syntex Animal Products through the courtesy of Dr. J. O. Reed.