J. Anim Sci.
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J. Anim Sci. 1979. 49:1577-1589.
© 1979 American Society of Animal Science

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Free Amino Acids in Blood of Ruminants—Physiological and Nutritional Regulation1 ,2,

Werner G. Bergen3

Michigan State University, East Lansing 48824

Abstract

Tissue free amino acid pools account for only a small fraction of the total amino acid content in the body. Blood or plasma free amino acid pools represent only a very small proportion of tissue free amino pools. Plasma free amino acid profiles have been used as a tool to study nutritional and metabolic aspects of protein status. Static measurements of plasma amino acid levels have limited value as sensitive indicators of protein status because such measurements do not reflect the magnitude of amino acid fluxes in and out free amino acid pools. Use of plasma amino acid profiles, under well defined experimental conditions, in assessing limiting amino acids and essential amino acid requirements in ruminants is discussed.


Footnotes

1 Michigan Agr. Exp. Sta. Journal Arcticle No. 9048.

2 Invited paper, presented at the 70th Annu. Meet, of the ASAS, Michigan State Univ., East Lansing, July 11,1978.

3 Ruminant Nutrition Laboratory, Dept. of Animal Husbandry.




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Copyright © 1979 by the American Society of Animal Science.