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Evaluation of Oleandomycin in Lamb Fattening Rations

Chas. Pfizer & Co., Inc., Terre Haute, Indiana

Abstract

Five lamb feeding experiments were conducted to determine the effect of oleandomycin supplementation on weight gains, feed efficiency, dressing percent and carcass grade. During the experimental period all lambs were self-fed a pelleted high-grain ration. In seven treatment groups lambs fed a ration containing 2 gm. of oleandomycin per ton outgained the controls by an average of 9.6% with a 5.4% average improvement in feed efficiency. In four treatment groups 6 gm. per ton resulted in an 18.9% increase in rate of gain and a 9.6% improvement in feed efficiency. Dressing percent and grade were improved with the 6-gm. level. In five treatment groups, 15 gm. per ton of oxytetracycline increased gain by 12% with a 6% improvement in feed efficiency. In two of the experiments urinary calculi occurred and both oleandomycin and oxytetracycline at 15 gm. per ton substantially reduced the incidence of this condition.