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The Excretion of Vitamin B₁₂ by Dairy Cattle

New Hampshire Agricultural Experiment Station¹

Abstract

The extent of vitamin B₁₂ synthesis in the gastrointestinal tract of dairy cattle has been indicated by quantitative intake and excretion data. The amount of such synthesis is relatively very great, the excretion exceeding the intake, in the case of the older animals, 40 to 55 times, on a ration of mow-cured hay and oats. Rations containing either oats or corn do not differ significantly in their favorable effect on the rumen synthesis of vitamin B₁₂. Very little B₁₂ was found in the urine, nearly all of that excreted being in the feces.

¹ Published with the approval of the Director of the New Hampshire Agricultural Experiment Station as Scientific Contribution No. 173.