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Chlortetracycline and Oxytetracycline at High Levels in a Protein Supplement for Growing-Finishing Swine

Purdue University Agricultural Experiment Station^,2

Abstract

Additions of chlortetracycline at levels from 50 to 250 gm. per ton of protein supplement fed to healthy pigs on concrete resulted in a highly significant (P<0.01) increase in gains. Differences in gains between lots fed the different levels of antibiotic were not statistically significant. Similar additions of oxytetracycline at those levels for pigs on pasture failed to increase gains significantly.

Average daily feed intake was increased by both antibiotics at all levels, but feed efficiency was not consistently improved.

¹ The authors express their sincere appreciation to the American Cyanamid Co., Pearl River, N. Y. and to the Chas. Pfizer and Co., Brooklyn, N. Y. for grants in partial support of this project and for the antibiotics used in this investigation.

² Contribution from the Department of Animal Science, Journal Paper No. 1422, Purdue University, Lafayette, Indiana.