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Effects of Feeding Aureomycin to Dairy Calves

Dairy Cattle Research Branch, USDA, Beltsville, Maryland

ABSTRACT

Aureomyein was fed for 3 mo. to dairy calves in two herds with different feeding and management practices. Increased body weight gain was obtained in both herds. However, the greatest increase occurred after the milk-feeding period in the herd where no milk was fed after 2 mo. of age. An increase in feed consumed (mosty roughage), efficiency of feed utilization, and a decrease in the incidence of diarrhea were observed when aureomyein was fed. When aureomyein was removed from the ration, the calves gained less and had a lower efficiency for the following 1 or 2 mo. than calves that had not received aureomyein. Heifers that had been fed aureomyein as calves weighed no more at .5 to 1 yr. of age than calves that had not been fed aureomyein. Therefore, the major advantage in feeding aureomyein to calves is the reduction in the incidence of diarrhea and not the temporarily increased growth rate. There was an indication that the aureomyein growth response varied in calves from different sires.