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Effect of Chlortetracycline, Stilbestrol and Chlortetracycline-Stilbestrol Supplements on Fattening Lambs¹

University of Minnesota^2,3,

Abstract

Under the conditions existing in this trial, 21.6 mg. of chlortetracycline (Aureomycin) per lamb daily, 2 mg. of stilbestrol per lamb daily or a combination of chlortetracycline and stilbestrol at those two levels had no significant effect on rate of gain, feed consumption or feed efficiency whether added to a ration with a concentrate-roughage ratio of 35–65 or 45–55. Carcass grade was slightly improved by the higher level of concentrate feeding and by chlortetracycline addition. Carcass yield was not affected by treatment or level of concentrate feeding.

¹ Paper No. 3377 Scientific Journal Series of the Minn. Agr. Exp. Sta., St. Paul.

² Stilbestrol feed supplement was donated by Eli Lilly and Company through the courtesy of Dr. J. F. Downing, and the chlortetracycline was donated by Lederle Laboratories through the courtesy of Dr. R. F. Elliot.

³ This project was supported in part by Grants-In-Aid from Lederle Laboratories Division, American Cyanamid Company, Pearl River, New York.