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Effects of Cortisone on Ruminant Performance¹

Washington State University, Pullman

Abstract

MANY hormones are secreted by the adrenal cortex and their effects and interactions among themselves and with other factors are complex. In laboratory animals cortisone has been shown to enhance the deposition of liver and muscle glycogen (Ingle, 1951; Kerppola, 1952) and liver fat (Wood and Goldstein, 1953). Stoerck and Porter (1950) demonstrated that adipose tissue was increased feedlot performance of lambs treated with cortisone acetate.

The purpose of this paper is to present data on the effects of cortisone acetate on the performance of fattening lambs and growing steer calves and to compare the effects of administration of this hormone on animals in moderate as compared to low ambient temperatures. Preliminary reports of two of these experiments with feedlot lambs have been given previosly (Dyer et al., 1960).

Experimental

In experiment 1,³ 3 50 feeder lambs averaging 77 lb. were randomly allotted into five groups of 10 animals and full fed a commercial fattening ration for 55 days during the winter.

¹ Scientific Paper No. 2197. Washington Agricultural Experiment Station. Project 1217.

² Appreciation is expressed to Armour and Co., Chicago, Ill., for providing the cortisone and to Mr. Irby Bunding (formerly of Armour and Co.), Shell Chemical Co., Modesto, California, for advice and help during the first experiment.