Using fermented juice of epiphytic lactic acid bacteria (FJLB) and molasses to improve digestibility and rumen fermentation characteristics of ruzigrass silage fed to dairy cows

摘要

The effects of fermented juice of epiphytic lactic acid bacteria (FJLB) and molasses (MO) on ruzigrass silage digestibility and rumen fermentation characteristics in dairy cows were studied. All treated silages were well-preserved as indicated by thepH value and NH3-N content. Silage treated with MO or MO-FJLB had lower pH and higher lactic acid contents than untreated silages and FJLB silages. Butyric acid was not detected in the FJLB silage. Water soluble carbohydrate (WSC) was higher in the MO silages; neutral detergent fiber (NDF) and acid detergent fiber (ADF) did not differ significantly. Dry matter intake in cows fed with all silages did not differ among diets. The CP digestibility of the FJLB silage was higher than the other silages. For rumen characteristics, pH value was lower in cows fed with MO silages. However, volatile fatty acid content in rumen fluid and blood urea nitrogen (BUN) contents did not differ significantly among silages. The cellulolytic bacteria populations were significantly higher in cows fed FJLB and MO-FJLB silages than in cows fed untreated silages. In conclusion, adding FJLB to ruzigrass silage improved fermentative quality, digestibility of crude protein and increased cellulolytic bacteria counts in cows.