不同饲料原料营养价值及对肉牛瘤胃体外发酵特性的影响OA

The aim of this experiment was to analyze the nutritional composition of different feedstuffs and to assess their methane production potential and their effect on the in vitro fermentation characteristics of beef cattle using in vitro gas production.Soybean meal,rapeseed meal,sesame meal,palm meal,brew-er's lees,dry white wine lees and dry corn lees were used as fermentation substrates,and the gas produc-tion,dry matter degradation rate(DMD),volatile fatty acid(VFA),ammoniacal nitrogen(NH3-N),mi-crobial protein(MCP),and pH were determined using gas-producing flasks with in-vitro gas-producing method.The results showed that the highest crude protein(CP)among the raw materials were soybean meal(47.88％)and sesame meal(47.30％),followed by rapeseed meal(39.91％).Soybean meal and cano-la meal had the fastest gas production rate(P＜0.01)at 0h-24h of fermentation,with the rapid gas pro-duction of canola meal being significantly higher than that of other fermentation substrates(P＜0.01).Fermentation of soybean meal and canola meal produced significantly higher total VFA and acetic acid con-centrations than the other substrates(P＜0.01).The in vitro degradation rate of soybean meal(82.39％)was the highest,significantly higher than that of the rest of the substrates(P＜0.01);the NH3-N concen-tration of sesame meal(30.97％)was the highest,significantly higher than that of the rest of the sub-strates(P＜0.01);and the MCP concentration of canola meal(56.75％)was the highest,significantly higher than that of the rest of the substrates(P＜0.01).Methane emissions varied among fermentation substrates,with soybean meal(22.15％)and canola meal(20.91％)having significantly higher methane e-missions than the rest of the substrates(P＜0.01),while dry white wine lees(13.28％)had the lowest methane emissions(P＜0.01).In summary,there are some differences in nutritional value,in vitro fer-mentation characteristics and methane emission among different feeds,among which canola meal with high in vitro fermentation dry matter digestibility,gas production and microbial protein content is a suitable protein source for ruminant diets and can be developed and utilized as a good protein feed resource.