5WHITER A G, KUNG Jr L. The effect of a dry or liquid application of Lactobacillus Plantarum MTD1on the fermentation of alfalfa silage[J]. J Dairy Sci, 2001, 84:2195-2202.
6WEATHERBURN M W. Phenol-hypochlorite reaction for determinations of ammonia[J]. Anal Chem, 1967, 39: 971-974.
7VAN SOEST P J, ROBERTSON J B, LEWIS B A. Methods for dietary fiber, neutral detergent fiber, and nonstareh polycarbohydratess in relation to animal nutrition[J]. J Dairy Sci, 1991, 74:3583-3597.
8XIONG Y, BARTLE S J, PRESTON R L. Improved enzymatic method to measure processing effects and starch availability in sorghum grain[J]. J Anirn Sci, 1990, 68.. 3861-3870.
9TILLY J M A, TERRY R A. A two stage technique for the in vitro digestion of forage crops[J]. J Br Grassland Soc, 1963, 18: 104-111.
10SAS Institute Inc. SAS/STAT software: changes and enhancements though release 8.02[M]. Cary, North Carolina.. SAS Institute Inc. , 1999.