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The flow of amino acids into the small intestine of cattle when fed heated and unheated beans (Vicia faba)

Published online by Cambridge University Press:  27 March 2009

N. P. McMeniman  and
D. G. Armstrong
N. P. McMeniman
Affiliation:
Department of Agricultural Biochemistry, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU
D. G. Armstrong
Affiliation:
Department of Agricultural Biochemistry, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU
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Summary

The effect of substituting different amounts of heated and unheated beans for barley in diets to cows, on the flow of total nitrogen (N), total amino acid nitrogen (TAA-N) and individual amino acids into the proximal duodenum was studied. Neither heating of the beans nor increasing their proportion in the diet significantly increased the flow of total N at the duodenum; however, increasing the proportion of beans did increase the flow of TAA-N. The substitution of both forms of cracked beans for barley, and at both levels significantly increased the flows of leucine and aspartic acid; flows of histidine, isoleucine, phenylalanine and serine were increased by substitution of both forms of beans but only at the higher level. In the bean supplemented diets significant proportions of all of the ingested amino acids except methionine were apparently destroyed in the forestomachs. The substitution of beans for barley resulted in a net increase of 0·2 g TAA-N flow into the proximal small intestine for each gram of additional dietary N.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 93 , Issue 1 , August 1979 , pp. 181 - 188
Copyright
Copyright © Cambridge University Press 1979

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