4COTTA M A. Interaction of luminal bacteria in the production and utilization of dextrins form soluble starch [ C ]//Proceedings of the 20th conference on ru- men function. Chicago : [ s. n. ] , 1989:44. ( Abstr. ).
5BRODERICK G A, CRAIG W M. Metabolism of pep- tides and amino acids during in vitro protein degrada- tion by mixed rumen organisms [ J ]. Journal of Dairy Science, 1989,72:2540 - 2548.
6SOCHA M T,PUTNAM D E, GARTHWAITE B D, et al. Improving intestinal amino acid supply of pre and postpartum dairy cows with rumen protected me- thionine and lysine [ J ]. Journal of Dairy Science, 2005,88:1113 - 1126.
7BROOKS C C, GARNER G B, GEHRKE C W, et al. The effect of added fat on the digestion of cellulose and protein by ovine rumen microorganisms [ J ]. Jour- nal of Animal Science, 1954 ( 14 ) : 210 - 215.
8SALTER D N. The origin of nitrogen incorporated in- to compounds in the bacteria of steers given protein and urea-containing diets[J]. British Journal of Nutri- tion, 1979,41 : 197 - 203.
9BERTHIAUME R, LAPIERRE H, STEVENSON M, et al. Comparison of the in sire and vivo intestinal dis- appearance of ruminally protected methionine [ J ]. Journal of Dairy Science,2000,83:2049 - 2056.
10TITGEMEYER E C, MERCHEN N R, BERGER LL. Evaluation of soybean meal, corn gluten meal, blood meal and fish meal as sources of nitrogen and a- mino acid disappearing from the small intestine of steers [ J ]. Journal of Animal Science, 1989,67 : 262 - 270.