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Comparison of Growth Responses of 2-Day-Old Pigs to Streptomycin, Aureomycin, and Crude APF, Alone and in Combination with B₁₂¹

University of Wisconsin²

Abstract

A "semisynthetic milk" (low B₁₂) using vitamin-free casein as a source of protein was fed to 2-day-old pigs to demonstrate the growth-stimulating effects of B₁₂, streptomycin, aureomycin, and crude APF.

A dietary requirement for B₁₂ for the baby pig was suggested.

Supplementation with aureomycin alone, aureomycin plus B₁₂, streptomycin plus B₁₂, and a combination of aureomycin, streptomycin, and B₁₂ increased the daily rate of gain over that of the control ration.

No growth-promoting effect resulted from the supplementation of streptomycin alone or crude APF to the basal ration.

Better growth was observed when streptomycin and B₁₂ were fed together than when streptomycin was fed alone. This was not apparent with aureomycin.

No consistent differences in the hemoglobin levels were apparent between the various lots.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. This work supported in part by Oscar Mayer & Co., Madison, Wis.

² Departments of Animal Husbandry and Biochemistry, Madison, Wis.