Effect of Various Levels of Vitamin B 12 Upon Growth Response Produced by Aureomycin in Chicks

Abstract

Summary

1. The vit. B₁₂ requirement for growth of chicks was studied on a deficient diet with and without the addition of aureomycin. In some experiments, a “sparing effect” of aureomycin upon vit. B₁₂ requirement was noted but in others no effect was observed. A growth-promoting effect for aureomycin was noted both in the presence and absence of added vit. B₁₂. 2. The mortality of deficient chicks on the diet containing no added vit. B₁₂ was markedly reduced by aureomycin. 3. The addition of sulfamethazine to the diet did not appear to effect the quantitative requirement of chicks for vit. B_12.