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The Effects of Hormones on the Growth and Fattening of Lambs¹

Purdue University Agricultural Experiment Station

Abstract

The subcutaneous implantation of 12 or 24 mg. of stilbestrol pellets significantly increased rate of gain and significantly increased feed efficiency. Carcass quality, as expressed by Federal grades, was consistently lowered.

The implantation of 30 mg. of testosterone propionate pellets significantly increased rate of gain and significantly increased feed efficiency but the magnitude of the increases was not as great as 24 mg.stilbestrol. Carcass quality was similar to the controls in both experiments.

Twelve mg. of dienestrol in one injectable base (Type A) significantly increased rate of gain and feed efficiency but in a second type of vehicle (Type B) dienestrol was not as effective. Carcass quality was inferior to the controls in both trials.

¹ Contribution from the Department of Animal Husbandry, Journal Paper No. 634, Purdue University, Agricultural Experiment Station, Lafayette, Indiana.

² The authors express their appreciation to Wick and Fry, Inc., for the stilbestrol, to the Ortho Research Foundation for the dienestrol and to the Ciba Pharmaceutical Products, Inc., for the testosterone used in these experiments.