The Vitamin B 12 Requirement of the Syrian Hamster. ∗

Abstract

Summary

A vit. B₁₂ requirement was not demonstrated for the Syrian hamster when fed either a corn-soybean oil meal ration with or without iodinated casein, or a casein basal ration with or without iodinated casein. No increase in the rate of gain was observed when 2% whole liver substance was added to these rations. Parallel experiments were conducted with rats fed the corn-soybean oil meal ration plus iodinated casein in which a vit. B₁₂ requirement was demonstrated. A reduction in food efficiency was observed in rats attributable to the vit. B₁₂ deficiency.