Abstract
AMINO-ACIDS occur at low concentrations in the liquid phase of rumen contents1,2 as intermediates in the breakdown of dietary proteins and in the production of microbial protein. The metabolism of these amino-acids has been investigated, mainly in washed suspensions of mixed rumen micro-organisms and pure cultures. There is abundant evidence of interaction in the metabolism of the amino-acids by the rumen microflora3,4. To obtain meaningful rates of utilization, physiological concentrations of all the amino-acids must be used. We report experiments in which glutamic and aspartic acids uniformly labelled with carbon-14 were added to whole rumen contents in true tracer amounts under conditions closely approaching those in the living animal.
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PORTUGAL, A., SUTHERLAND, T. Metabolism of Glutamic and Aspartic Acids in Whole Rumen Contents. Nature 209, 510–511 (1966). https://doi.org/10.1038/209510a0
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DOI: https://doi.org/10.1038/209510a0
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