6RUSSELL J B,O'CONNOR J D,FOX D G,et al.A net carbo- hydrate and protein system for evaluation cattle diets : I .Ru- minal fermentation [J ].J Anim Sci, 1992,70(11 ) :3551-3561.
7RUSSELL J B, STROBEL H J, CHEN G J.The enrichment and isolation of a ruminal bacterium with a very high specific activity of ammonia production [J].Appl Environ Microbiol, 1988,54 (4) : 872-877.
9PURSER D B,BUECHLER S M.Amino acid composition of rumen organisms [J].J Dairy Sci, 1966,49( 1 ) :81-84.
10STROBEL H J, RUSSELL J B.Effect of pH and energy spilling on bacterial protein synthesis by carbohydrate limited cultures of mixed tureen bacteria [ J ].J Dairy Sci, 1986,69 (11 ) :2941- 2947.
