3Whiter A G, L Kung Jr. The effect of a dry or liquid application of lactobacillus Plantarum MTDI on the Fermentation of alfalfa silage[J]. J Dairy Sci, 2001, 84: 2195-2202.
4SAS. SAS/STAT^(R) User's Guide (Release 8.2)[M]. Cary N C: SAS Inst Inc, 1999.