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Ruminal disappearance and intestinal digestibility of amino acids in intensively reared beef cattle

  • F. Vicente, J.A. Guada, S.M. Martín-Orúe and C. Castrillo

Extract

Manipulation of amino acids (AA) supply to the duodenum is constrained in ruminants by insufficient knowledge on the AA profile of undegradable protein. There is evidence that rumen degradability and intestinal digestibility of individual AA may differ from that of nitrogen (N) or total AA (TAA) (Erasmus et al., 1994, O'Mara et al., 1997) although differences in intestinal digestibility are probably of relevance only in roughage and overheated feeds (Van Straalen et al., 1997). The objective of this experiment was to provide more information about the relative influence of rumen degradation and intestinal digestion on the AA profile of the absorbed fraction of four protein sources commonly used in beef cattle rationing.

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Erasmus, L.J., Botha, P.M. and Cruywagen, C.W. 1994. Amino acid profile and intestinal digestibility in dairy cow or rumen-undegradable protein from various feedstuffs. J. Dairy Sci. 77: 541551.
O'Mara, F.P., Murphy, J.J. and Rath, M. 1997. The amino acid composition of protein feedstuffs before and after ruminal incubation and after subsequent passage through the intestines of dairy cows. J. Anim. Sci. 75: 19411949
Van Straalen, W.M., Odinga, J.J. and Mostert, W. 1997. Digestion of feed amino acids in the rumen and small intestine of dairy cows measured with nylon-bag techniques. Bri. J. Nutr. 11: 8397.

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