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Antibiotics in Rumen Digestion and Synthesis. II. The Effect of Aureomycin on the Concentration of Some Amino Acids and B Vitamins in the Rumen¹

Departments of Dairy and Agricultural Chemistry, Michigan Agricultural Experiment Station, East Lansing

ABSTRACT

The microbial synthesis of amino acids and B vitamins by ruminants on natural or supplemented rations has been indicated, and the literature has been comprehensively reviewed by McNaught and Smith (23) and Kon and Porter (14). Loosli et al. (19) were the first to show the synthesis by rumen microorganisms of the ten amino acids essential for the growth of the rat by feeding a purified ration to sheep. Urea supplied the only essential source of dietary nitrogen. Duncan et al. (9) fed essentially the same ration to fistulated steers and confirmed the synthesis of the ten amino acids and also found, with the exception of histidine, that the amino acid pattern of the mixed proteins in the ingesta of the steers on a purified ration was fundamentally similar to that found for a steer on a natural ration. Block and Stekol (3) and Block et al. (4) demonstrated that methionine and cystine are synthesized in the rumen from radioactive Na₂S³⁵O₄ at approximately the same rate and are used by the tissues to synthesize new protein.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal article No. 1439.

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

³ Present address: Department of Animal Husbandry, Cornell University, Ithaca, N. Y.