Effects of nutrient composition and fermentation quality of elephant grass silage under different treatments
The experiment aimed to study the effects of lactic acid bacteria,cellulase,and cornmeal on the sensory quality,nutritional components,and fermentation quality of elephant grass(Pennisetum purpureum)silage,providing a reference for optimizing the ensiling of elephant grass.Using elephant grass as experimental material,control group(group CK),lactic acid bacteria group(group A),cellulase group(group B),corn meal group(group C),lactic acid bacteria+cellulase group(group D),lactic acid bacteria+corn meal group(group E),cellulase+corn meal group(group F)and lactic acid bacteria+cellulase+corn meal group(group G)were set up,with three replicates in each group.After 30 days of silage fermentation,the sensory,nutrient composition and fermentation quality of elephant grass silage were detected by sampling.The results showed that compared with the control group,the mixed addition group(group D,group E,group F,group G)and the separate addition group(group A,group B,group C)had obvious silage acid flavor and bright yellow color,which could be rated as grade 1 excellent.Compared with the control group,the dry matter content of elephant grass silage in all treatment groups was significantly increased(P＜0.05),and the dry matter content in group G was the highest.Crude protein content in group G was significantly increased(P＜0.05).Except for group A and group C,the neutral detergent fiber content of elephant grass silage in other treatment groups was significantly decreased(P＜0.05).The content of acid detergent fiber in elephant grass silage in group F and group G was significantly decreased(P＜0.05).Soluble carbohydrate content and relative feeding value of elephant grass silage in all treatment groups were significantly increased(P＜0.05).The pH of elephant grass silage in all treatment groups was significantly lower than that in control group(P＜0.05),the lactic acid content was higher than that in control group(P＜0.05),the acetic acid content in elephant grass silage in group E,group F,and group G was higher than that in control group(P＜0.05),and no propionic acid and butyric acid were detected in all groups.The aerobic stability of elephant grass silage in all treatment groups was higher than that in control group(P＜0.05),with the mixed addition groups showing higher stability than the single addition groups(P＜0.05),and group G significantly outperformed the other treatment groups(P＜0.05).The results showed that adding lactic acid bacteria,cellulase,corn meal and different combinations of these substances in the silage process could improve the sensory,nutritional value and fermentation quality of elephant grass silage to varying degrees,and the effect of lactic acid bacteria+cellulase+corn meal group was the best.
万方数据
维普
