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Microbial protein kinetics for sheep fed with three different hays using 15N as marker

  • I. C. S. Bueno (a1), S. L. S. Cabral Filho (a1), C. Longo (a1) and A. L. Abdalla (a1)


Non-degradable dietetic protein supply depends on rumen degradation. Determination of microbial protein synthesized in the rumen as the result of microbial fermentation is important because microbial protein synthesis could be influenced by diet (Dove and Milne, 1994). Several evaluation systems consider the contribution of microbial protein on protein intestinal flow as a constant, based on feed intake. But this approach has presented great variations. The purpose of this work was to determine in vivo microbial protein kinetics for sheep fed with three protein level hays.


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Dove, H. and Milne, J. A. 1994. Digesta flow and rumen microbial production in ewes grazing perennial ryegrass. Australian Journal of Agricultural Research, 45: 12291245.
Grovum, W. L. and Williams, V. J. 1973. Rate of passage of digesta in sheep. 4. Passage of marker through the alimentary tract and the biological relevance of rate-constants in concentration of marker in faeces. British Journal of Nutrition, 30: 377389.
Van Soest, P. J. 1994. Nutrition ecology of the ruminant. 2nd ed. New York: Cornell University Press. 476p.
SAS, 2000. SAS Institute. The SAS system for windows. Release 8.01. Cary, 2000.


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