The aim of the study was to investigate the fermentation quality of mix-ensiling canola straw and corn silage,and evaluate its feeding value by in vitro ruminal simulation test.Canola straw and fresh fresh corn silage were mixed(2∶1,dry matter basis),with 60％of moisture content in the mixture.part of the mixture was collected and treated as the control group,while the rest was fermented in vessels(5 L)for 49 d(7W)and treated as mix-ensiling group,each group has 3 repetitions.The fermentation quality of mixed ensilages was evaluated after 49 days.and in vitro ruminal simulation test was conducted.Results showed the mix-ensiling canola straw and corn silage attained a superior femented feed level,which de-creased the neutral detergent fiber(NDF)and acid detergent fiber(ADF)content(P≤0.05).The mix-en-silage had greatly improved dry matter digestibility(DMD)and neutral detergent fiber degradation(ND-FD),total volatile fatty acid(TVFA)and microbial crude protein(MCP)concentrations(P≤0.05),but it significantly lowered acetate to propionate ratio and methane production(P≤0.05).The results reveal that mix-ensiling canola straw and corn silage can generate excellent fermentation quality,and enhance the fiber degradation rate and TVFA concentration.Additionally,it can promote a shift towards propinate production in the rumen fermentation pattern,and reduce methane production.Therefore,the mix-ensiling canola straw and corn silage is a potential strategy to improve the feeding value of canola straw.
维普
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