Effect Of Adding Wet Brewers' Grains And Molasses On Fermentation Quality Of Mixed Ensilages Of Common Vetch With Perennial Ryegrass Or Tall Fescue

The objective of this study was to evaluate the fermentation quality with mixture silages of common vetch and perennial ryegrass or tall fescue at different rations, and determined an appropriate mixed ration. The additives were used to improve the fermentation quality of mixed silage in this study. The additives are molasses (M:3%,4%,5%FW).wet brewers' grains (WBG:10%,20%,30%FW) and 3%M+10%WBG. The silos were opened on 7,14, 30, and 60 days of ensiling, separately. Three silos were used for each treatments and ensilage days.Experiment I:Effect of different mixed ratios on fermentation quality of mixture silages of common vetch and perennial ryegrassCommon vetch and perennial ryegrass were chopped and compositely ensiled in laboratory silos. Common vetch was in ratios of 100% (control),20% (CP20),30% (CP30) and 40% (CP40) (fresh weight basis). After 60 days of mixed ensiling of common vetch and perennial ryegrass, the pH value of control (4.77) was higher significantly (P<0.05), however LA content lower was lower notablely (P<0.05) than treatments. It was suggested that the silage quality of common vetch was bad, when the plant was harvested at the green pod stage and ensiled without other grass. According to general evaluation of fermentation quality of treatments' silage, it was suggested that the fermentation quality of CP30 was the worst.Experiment II:Effect of different mixed ratios on fermentation quality of mixture silages of common vetch and tall fescueCommon vetch was in proportions of 100%,20%,30% and 40% (fresh weight basis; denoted control, CT20, CT30 and CT40, respectively) when common vetch and tall fescue were chopped and made mixed silages. The results of silages of common vetch and tall fescue in different mixed rations are as follows:After 60 days of storage, the pH values of silage were not below 4.2; the values of pH and AN/TN of control were lower (P<0.05), whereas the contents of LA and WSC were higher (P<0.05) than treatments. These experimental results indicated that the common vetch of vegetative stage ensiled individually and obtained good fermentation quality. The fermentation quality of CT30 was the worst in experiment with high value of pH (5.88) and content of BA (35.79 g kg-1DM), low content of LA (8.37g kg-1 DM).ExperimentⅢ:Effect of adding WBG on fermentation quality of mixture silages of common vetch and perennial ryegrassCommon vetch and perennial ryegrass were mixed and ensiled in ratios of 3:7 (fresh weight basis). Adding WBG could decrease significantly (P<0.05) the values of pH and AN/TN of silage during early stage of ensiling, while the LA content was higher than control on day 7,14 and 60. On the 60th day of ensiling, the pH value of treatments was between 4.0 and 4.3, the LA content was 100g kg-1DM.The results indicated that the ensiling of treated with WBG got nice fermentation quality. According as the experimental results, the adding 10% level of WBG was optimal.ExperimentⅣ:Effect of adding M or M with WBG on fermentation quality of mixture silages of common vetch and perennial ryegrassOnly adding M could not markedly decrease the pH value of silage, but could significantly decrease (P<0.05) the AN/TN value and increase the WSC content on day 7, 30 and 60. The values of pH and AN/TN and the contents of AA and Total VFAs of silage were decreased significantly (P<0.05) by adding 3%M+10%WBG, which had higher contents of LA and WSC than control within initial 30 days of ensiling. There were not marked differences in the values of pH, the contents of AA and Total VFAs on the 60th day. The results showed that adding 5%M and 3%M+10%WDG could improve fermentation quality, especially 3%M+10%WDG gaining the best fermentation quality in all treatments.ExperimentⅤ:Effect of adding WBG on fermentation quality of mixture silages of common vetch and tall fescueCommon vetch and tall fescue were mixed and ensiled in ratios of 3:7 (fresh weight basis). After 60 days of ensilage, the silage pH value of treatments with adding WDG fell below 4.2. The values of pH, LA/AA and NA/TN of treatments were lower notablely (P<0.05), whereas the LA content were higher significantly (P<0.05) than control in the whole fermented period. The values of pH and AN/TN and the LA content were not marked differences (P>0.05) among treatments during late stage of ensiling. The WSC content of control was higher significantly (P<0.05) during early stage of ensiling, subsequently it was lower than treatments. The concentrations of AA and Total VFAs of silage without additive were higher significantly (P<0.05) than treatments within initial 30 days of ensiling, however there were not marked differences (P>0.05) between them. According to general evaluation of fermentation quality of treatments' silage, it was suggested that the fermentation quality of treatment with adding 20% WBG was the best.Experiment VI:Effect of adding M or M with WBG on fermentation quality of mixture silages of common vetch and tall fescueIt was effectless on decreasing the pH value and increasing LA content of silage with adding M, whereas addition of 3%M+10%WBG could obtain significantly effect (P<0.05) among all silages during the early stage of ensiling. There were not marked differences (P>0.05) in pH value between control and treatments during the late stage of ensiling. The AN/TN value of control was higher significantly (P<0.05) than that of treatments within initial 30 days. The separate addition M had no significant (P>0.05) effect on the value of AN/TN. Addition of M silages had higher AN/TN value comparing with the treatment addition M with WBG, then there were not notablely differences among all silages. The additives did not improve significantly the WSC concentration on day 7, subsequently that of addition 5% M and 3%M+10%WBG was higher than control. In terms of the measured parameters that separate addition M could not advance obviously fermentation quality, however additive M with WBG could do.