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Journal of Animal Science, Vol 70, Issue 9 2885-2892, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Plasma amino acid response to graded levels of escape protein

D. J. Gibb, T. J. Klopfenstein, R. A. Britton and A. J. Lewis
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.

A trial was conducted to examine the potential of using plasma amino acid responses to graded levels of escape protein to determine limiting amino acids in cattle. Growing calves (n = 120; mean BW = 220 +/- 21 kg) were fed a basal diet of corncob:sorghum silage (61:39) and were individually supplemented with distillers' dried grains (DDG), heat-damaged DDG (H-DDG), feather meal (FTH), or urea. The urea supplement was mixed with DDG and H-DDG to allow 0, 20, 35, 50, 65, or 80% of the supplemental CP to come from distillers' protein and maintain an 11.5% CP diet. Urea supplement was mixed with FTH to allow 0, 22, 39, 56, 73, or 90% of the supplemental CP to come from FTH. Dietary CP ranged from 11.5% at the 0% level to 17.3% at the 90% level. Plasma concentration of most essential plasma amino acids responded (P less than .10) linearly and(or) quadratically to increased escape protein. The broken-line response of plasma methionine at low DDG intake suggested that methionine was limiting at low levels of escape protein. An initial decrease followed by a plateau fit by a broken line indicated that histidine became limiting in FTH diets, and lysine eventually became limiting for DDG, H-DDG, and FTH diets before maximum BW gain was reached. Results indicate that plasma amino acid responses may identify amino acids that become limiting with increasing escape protein.


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J. L. Figueroa, A. J. Lewis, P. S. Miller, R. L. Fischer, and R. M. Diedrichsen
Growth, carcass traits, and plasma amino acid concentrations of gilts fed low-protein diets supplemented with amino acids including histidine, isoleucine, and valine
J Anim Sci, June 1, 2003; 81(6): 1529 - 1537.
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Copyright © 1992 by the American Society of Animal Science.