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Effect of APF Concentrate Containing Aureomycin on Gestating, Lactating, and Growing Swine^{1, 2,}

University of Minnesota³

Abstract

The 56-day weaning weight of pigs was increased from 25 to 36 pounds by feeding sows a diet containing 0.5% of an APF supplement containing aureomycin and providing a creep diet that contained 1% of the supplement. The growth stimulation was not due to any substance transferred to the pigs through the milk, but could be attributed entirely to the aureomycin present in the APF supplement included in the creep diet, as was demonstrated when a similar growth stimulation was obtained by feeding a creep diet containing pure aureomycin.

Feeding an APF supplement containing aureomycin for 49 to 90 days prior to parturition did not affect litter size or size and livability of newly born pigs.

Under the environmental conditions imposed, the growth rate and efficiency of feed utilization of weaned pigs fed a creep diet containing aureomycin during the nursing period can be stimulated by feeding diets containing aureomycin. Reducing the level of antibiotic supplement at weaning time or three weeks after weaning resulted in a decrease in rate of gain and efficiency of feed utilization and an increase in the incidence of diarrhea.

¹ This work was supported in part by Lederle Laboratories Division of the American Cyanamid Company, Pearl River, New York, who also furnished the APF supplement and the pure aureomycin hydrochloride.

² Hormel Institute publication No. 61.

³ The Hormel Institute, Austin, Minn.