3HRISTOV A N, MCALLISTER T A, CHENG K J. Stability of exogenous polysaccharide degrading emzymes in rumen[J].Animal Feed Science and Technology, 1998,76:161-168.
4Yang. W.Z. Journal of Dairy Science. 1999,82(2):391-430.
6Jaster. E.H. Journal of Dairy Science. 1998.71(3),705-711.
7Lewis G E, Hunt C W, Sanchez W K, et al. Effect of direct-fed fibrolytic enzymes on the digestive characteris tics of a forage-based diet fed to beef steers[J].J Anim Sci, 1996,74: 3020-3028.
8Pritchard G, Hunt C, Allen A, et al. Effect of direct-fed fibrolytic enzymes on digestion and growth perfor mance of beef cattle[J].J Anim Sci, 1996,74:296.
9Sanchez W K, Hunt C W, Guy M h, et al. Effect of fibrolytic enzymes on lactational performance of dairy cows[J].J Dairy Sci, 1996,79(1):183.
10Luchini N D, Broderick G A, Hefner D L, et al. Production response to treating forage with fibrolytic enzymes prior to feeding to lactating cows[J]. J Dairy Sci, 1997,80:262.