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Effects of Fat, Oxytetracycline, and Stilbestrol on Performance and Hepatic Stores of Carotene and Vitamin A in Steers

State College of Washington, Pullman^{1, 2,}

Abstract

Results of two experiments are reported in which fat, oxytetracycline and stilbestrol were fed to yearling steers. The finely ground, all-pelleted rations with which these compounds were fed were not conducive to maximum feed consumption. Rates of gain were increased significantly by the incorporation of either oxytetracycline, stilbestrol or a combination of the two. In these experiments, fat fed at a high level (7% of the ration) did not significantly increase rates of gain, probably because of the accompanying reduction in digestibility of dry matter and crude fiber. Hepatic vitamin A levels were significantly higher in steers fed oxytetracycline.

¹ Scientific Paper No. 1587, Washington Agricultural Experiment Stations, Pullman. Project No.1217.

² Appreciation is expressed to Chas. Pfizer and Co., Inc. for support of this project and for supplying the oxytetracycline; National Renderers Association for support of this project; Mr. Herbert Collison, Asst. Beef Cattle Herdsman, for feeding and care of the experimental animals.