4Robowsky K D,Hertwig F,Nenbert G. What biological silage additives can do[J]. DLG Itteilungen Agri Inform, 1993, (5):37-39.
5Chaudhry A S. Chemical and biological procedures to upgrade cereal straws for ruminants[J]. Nutr Abstr Rev(Series B),1998,68:329-331.
6Chamberlain D C,Robertsons S. The effects of the addition of various enzyme mixtures on the fermentation of perennial ryegrass silage and on its nutritional value for milk production in dairy cows[J]. Anim Feed Sci Technol, 1992,37: 257-264.
7Chen J,Stokes M R,Wallace C R. Effects of enzyme inoculation systems on preservation and nutritive value of hay crop and corn silages[J]. J Dairy Sci,1994,77:501-512.
8Vuuren Van A M,Bergsma K,Frol kramer F,et al. Effects of addition of cell wall degrading enzymes on the chemical compo sition and in sacco degradation of grass silage [J]. Grass and Forage Sci, 1989, (4): 223- 230.
9Stokes M R,Chen J. Effect of an enzyme inoculation mixture on the course of fermentation of corn silage[J]. J Dairy Sci, 1994,77(11):3 401-3 409.
10Jacobs J L,Cook J E,Acallan A B. Enzymes as silage additives.2. The effect of grass dry matter content on silage quality and performance in sheep[J]. Grass Forage Sci, 1991,46 (2): 191-199.