PROTEIN METABOLISM IN THE RUMEN. I. ABSORPTION OF GLYCINE AND OTHER AMINO ACIDS.

Abstract The absorption of glycine, serine, threonine, methionine sulfoxide, aspartic acid, asparagine + glutamine, isoleucine, and leucine from the rumen was demonstrated using both in vitro and in vivo techniques. Four amino acids not normally present in human blood were found in ruminant blood. These amino acids chromatograph on Dowex 50-X8 similar to phosphoserine and cysteic acid, phosphoethanolamine, and methionine sulfoxide. Measurable amounts of 11 different acidic and neutral amino acids were found in rumen fluid from a steer fed normal rations of grain and hay. Serine was present in highest concentration. Methionine sulfoxide appeared in rumen fluid after methionine was added to the rumen. The data show that amino acids are absorbed from the rumen and contribute in this manner to the absorption of nitrogen from the alimentary tract.

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