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Effects of Feeding Aureomycin¹ to Lactating Dairy Cows^,2

Tennessee Agricultural Experiment Station, Knoxville

ABSTRACT

Sixty-two pairs (33 Jersey and 29 Holstein pairs) of milking cows were used to compare aureomycin supplementation with a control ration for a 12-wk. period. Treated cows were fed at the rate of 10 mg. per 100 lb. body weight. Seventeen pairs were continued on the experiment for 17 wk. and another eight pairs for 6 mo. The differences between the two groups of cows in milk production and body weight changes were not significant at the 5% level. The cows receiving aureomycin showed no obvious advantage in resistance to mastitis, foot rot, or other bacterial disturbances throughout the study.

¹ Trademark of the American Cyanamid Company for the antibiotic, chlortetracycline, which was furnished by the American Cyanamid Company, Princeton, New Jersey.

² A portion of this work was conducted in cooperation with the Dairy Cattle Research Branch, Beltsville, Maryland.

³ Current address: Department of Dairy Science, Pennsylvania State University, University Park.