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Present Status of Feeding Antibiotics to Lactating Dairy Cows

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

During the past few years considerable interest has been shown by researchers, feed manufacturers, and dairymen in the possible beneficial effects of feeding certain antibiotics to lactating dairy animals. It is the purpose of this review to provide an up-to-date appraisal of this situation.

The renewed interest in antibiotic feeding to dail T cows grew out of work in two areas. One was the observation with fattening beef cattle (15), that continuous low level feeding of antibiotics, particularly chlortetracycline, usually improved the weight gains of cattle. The dosage rate used was 75 lug per head daily. The second area was the claim of the American Cyanamid Company, manufacturer of chlortetracycline, that continuous low-level feeding of this antibiotic to cattle (both beef and dairy) reduced the incidence of foot rot, pneumonia, and shipping fever.

On the basis of the data presented by the manufacturer, the Food told Drug Administration in November of 1957 approved the feeding of aureomycin (chlortetracycline) to milking cows.