Nitrogen Metabolism in the Ruminant: a Review
نویسنده
چکیده
Current systems for the evaluation of protein-feeds for ruminants take account of two principal nitrogen (N) requirements. One is to satisfy the needs of the rumen micro-organisms in order to maximize. microbial protein yield this N can largely be provided in any form that will give rise to enough ammonia in rumen fluid. The other N requirement is for a dietary source of true protein that wi,ll pass out of the rumen unfermented,(a bypass protein) and augment the microbial amino acid supply in the small intestine when the latter are inadequate for a specific productive function (maintenance, growth, wool growth, . lactation). The level of productivity (up to the limit set by the genetic potential) is set by the digestible organic matter intake (DOFII) . which is therefore a determinant of tissue N demand.
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