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Methionine and Antibiotic Supplementation for Growing Swine at Three Protein Levels¹

University of Georgia²

Abstract

A factorial experiment was used to measure the effect of supplementing swine rations containing various levels of protein with an antibiotic and/or methionine.

In the absence of antibiotic supplementation, a 17-14-11% protein combination from weaning to terminal weights produced a higher rate of gain than did a 14-11-8.4% protein combination. No difference was obtained between protein levels when chlortetracycline was added to the rations.

There was a marked increase in rate of gain as a result of antibiotic supplementation of the rations employed. Methionine supplementation was without effect.

The data revealed no interaction either of antibiotic and protein level or of methionine and protein level.

¹ The authors wish to acknowledge American Cyanamid Co., Pearl River, N. Y., and E. I. DuPont de Nemours and Co., Wilmington, Delaware for providing products used in this investigation. Acknowledgement is also due J. L. Carmon for assistance in the statistical treatment of the data.

² Contribution from the Department of Animal Husbandry, Athens, Georgia. Journal Paper No. 51 of the College Experiment Station.