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The Growth Promoting Effects of Various Antibiotics on Pigs¹

Michigan Agricultural Experiment Station

Abstract

1. Streptomycin fed at levels of 10 mg. per pound of feed in a corn-soybean and a mixed ration resulted in a small increase in the growth rate of young pigs, but this increase was not statistically significant. However, the addition of liberal quantities of niacin, calcium pantothenate and riboflavin plus the streptomycin increased the growth rate on both rations significantly.
   
2. Aureomycin fed at levels of 10 mg. per pound of feed increased significantly the growth rate of young pigs fed a B vitamin fortified corn-soybean ration. Procane penicillin was also found to be effective in this respect at levels of 1 and 5 mg. per pound of feed.
   
3. A dried APF product, containing aureomycin, gave excellent growth when fed at levels of 0.35% in a B vitamin fortified corn-soybean ration.
   

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1195.

² Departments of Agricultural Chemistry, Animal Pathology and Animal Husbandry, Michigan State College, East Lansing. The authors are indebted to Merck & Co., Inc., Rahway, New Jersey for B vitamins, streptomycin and procane penicillin; to Lederle Laboratories Division, American Cyanamid Co., Pearl River, New York for B vitamins, aureomycin and APF; and to The Upjohn Co., Kalamazoo, Michigan for neomycin.