Effects of previosly fermented juice and cellulose enzyme on the dynamic fermentation changes of King grass silages

This study is to evaluate effects of adding previously fermented juice and cellulose enzyme on the fermentation quality of King grass silages. The experimental treatments were CK(no additive), PFJ(previously fermented juice), CEL(cellulose enzyme)and PC(previosly fermented juice and cellulose enzyme). Silos were opened after seven ensiling periods(1, 2, 3, 5, 7, 14 and 30 days of ensiling)and the fermentation qualities(pH value, VFAS, the contents of ammonia-N and WSC and other chemical composition)were analyzed. All treatments did not influence the DM after ensiling. There was well reflected faster and larger pH decline and lactic acid production during the first day of ensiling and the lowest pH value in the 5th day of ensiling. All additive treatments had a significantly(P0.05)lower pH value than CK. Lactic acid, acetic acid, propionic acid, total volatile fatty acid content and AN/TN value rose gradually, and the change of butyric were contrary in between PFJ and CK. Propionic acid and butyric acid were not found in PC, PC also hold concurrently the advantage of PFJ improved crude protein content and CEL reduced neutral detergent fiber content to increase water soluble carbohydrate content. These results showed that mixing add previosly fermented juice and cellulose enzyme to the silage was the optimum for fermentation quality of King grass.