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Journal of Nutrition Vol. 49 No. 4 April 1953, pp. 631-638
Copyright © 1953 by American Society for Nutrition
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A Quantitative Study of Rumen Synthesis in the Bovine on Natural and Purified Rations

III. Riboflavin, Pantothenic Acid and Niacin1

I. P. Agrawala2,3,, C. F. Huffman, R. W. Luecke and C. W. Duncan

Departments of Dairy and Agricultural Chemistry, Michigan State College, East Lansing

The ingesta obtained from 7 trials with rumen fistulated calves were analyzed microbiologically to determine the capacity of rumen microorganisms to synthesize riboflavin, pantothenic acid and niacin from the medium components of a purified ration which contained urea as the only essential source of nitrogen.

Quantitative evidence was obtained to indicate that the microorganisms were able to synthesize as much riboflavin and niacin, but only 50% as much pantothenic acid, within 6 hours after feeding as was found in the rumen of a calf maintained on a natural ration.

The average of 7 trials showed that the calves on the purified ration synthesized 20, 31 and 154 mg of riboflavin, pantothenic acid and niacin, respectively, within 6 hours after feeding. The increased amounts of these B vitamins found in the rumen of the calf on the natural ration were approximately equivalent to the amounts ingested in the feed.

1 Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article 1433.

2 This article is part of a dissertation presented to the Faculty of the Graduate School of Michigan State College in partial fulfillment of requirements for the degree of Doctor of Philosophy.

3 Government of India Scholar. Present address: Indian Veterinary Research Institute, Izatnagar, U. P., India.

Manuscript received 24 November 1952.




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