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The Influence of Vitamin B₁₂ and Aureomycin Supplementation in the Ration on the Vitamin B₁₂ Activity of Pork Muscle^{1, 2,}

University of Wisconsin³

Abstract

The results of the influence of vitamin B₁₂ and aureomycin supplementation in the ration on the vitamin B¹² activity of pork muscle have been investigated.

The pigs which received a ration supplemented with vitamin B₁₂ responded with an increased vitamin B₁₂ activity of the muscle.

In experiment I the feeding of aureomycin with or without supplements of B₁₂ lowered the concentration of vitamin B₁₂ in pork muscle except at medium protein level.

In experiment II the depression of B₁₂ deposition in the muscle tissue was again found in the lots receiving aureomycin alone, yet in this experiment the interaction of aureomycin and B₁₂ was not present.

The deposition of intramuscular fat under the conditions of these two experiments appears to be an inverse response to the level of protein fed rather than to treatment with vitamin B₁₂ and antibiotic.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

² The authors are indebted to Dr. J. E. Burnside, Dr. G. D. Wilson, and Prof. R. A. De Pape for tissue samples used in this experiment.

³ Departments of Animal Husbandry and Biochemistry, Madison, Wisconsin.