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Alteration of Daily Gain, Feed Efficiency and Carcass Characteristics in Beef Cattle with Male Hormones^{1, 2,}

Abstract

The weekly intramuscular injection of testosterone at the rate of 1 mg./kg. of body weight resulted in an increase in rate of gain and a decrease in feed required per unit gain. Testosterone-treated heifers had a higher percent of chuck than control heifers and testosterone-treated heifers and steers had a higher percent of round and a lower percent of loin than control calves.

The weekly intramuscular injection of methyl androstenediol at the rate of 1 mg./kg. of body weight had little or no effect on rate of gain, economy of gain or carcass characteristics.

¹ This study was conducted in cooperation with Bureau of Animal Industry, U. S. Department of Agriculture, and State Experiment Stations under Western Regional Project W-1 on Beef Cattle Breeding Research.

The authors are grateful to the Schering Corp., Bloomfield, New Jersey, who supplied the hormones used in these experiments.

² Approved for publication as technical paper 791 by the Director of Oregon Agricultural Experiment Station. Contribution of the Department of Animal Husbandry.

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