反刍动物瘤胃内源氮代谢研究进展

蛋白质需要量研究是反刍动物蛋白质营养的核心, 而准确测定进入瘤胃并被微生物利用的内源氮是测定饲料蛋白质真消化率和反刍动物蛋白质需要量的关键步骤.为此, 文章综述了近30年内关于反刍动物内源氮来源、内源氮代谢的研究方法、进入瘤胃的内源尿素氮、内源总氮以及各部分氮对合成微生物氮的贡献的研究进展.

Review on endogenous nitrogen recycling in the rumen of ruminants

Study on protein requirement is the central research work in protein nutrition in ruminants and the exact measurement of endogenous nitrogen entering the rumen and efficiently utilized by microbial constitutes an important step for the estimation of true digestibility of dietary protein and protein requirements in ruminants. The objective of this article was to review studies on the sources of endogenous nitrogen, research methods of endogenous nitrogen recycling, endogenous urea nitrogen and total nitrogen entering the rumen of ruminants, and the proportion of nitrogen absorbed by microbe as reported in recent 30 years.