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Accounting for ruminal deficiencies of nitrogen and branched-chain amino acids in the structure of the cornell net carbohydrate and protein system

机译:康奈尔碳水化合物和蛋白质系统结构中氮和支链氨基酸瘤胃缺乏的核算

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The rumen typically operates as an energy-limited, nitrogen-excess system, but diets can be so low in degradable crude protein that microbial growth is limited by N. Ruminal bacteria respond differently to N sources and N-limitation. Cellulolytic ruminal bacteria need ammonia as an N source, have little capacity to utilize amino-N, are unable to ferment fiber when ammonia is depleted, and do not produce ammonia from amino-N sources. Some hemicellulose-digesting ruminal bacteria are stimulated by amino-N, but even these species are primarily dependent on ammonia as an N source. Many nonfiber digesting ruminal bacteria prefer amino-N to ammonia, and some can even produce ammonia from amino-N source.
机译:瘤胃通常用作能量有限的氮过量系统,但在可降解的粗蛋白中可以如此低,即微生物生长受到N.瘤胃细菌的限制为N来源和N限制。纤维素分解瘤细菌需要氨作为N个源,在氨耗尽时具有氨基-N的氨基-N的能力不能发酵纤维,并且不会产生来自氨基-N源的氨。氨基-N刺激一些半纤维素消化瘤细菌,但即使这些物种也主要依赖于氨作为n个源。许多非纤维消化瘤胃细菌更喜欢氨基-N至氨,并且一些甚至可以从氨基-N源产生氨。

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