中文摘要：

试验通过评定菜籽粕、玉米、米糠、苜蓿、玉米青贮和玉米秸秆的营养价值来比较瘤胃尼龙袋法和体外产气实验。结果表明：各种饲料的干物质有效降解率分别为52.90%、54.27%、65.70%、40.76%、37.24%和38.17%,精饲料干物质有效降解率（EDMD）中,a部分占比例较高（其中米糠达到64.51%）;每克饲料DM的渐进产气量（A）分别为105.00、180.51、109.30、172.71、147.76和148.66 mL,粗饲料的产气量普遍高于精饲料;两种方法中,产气参数A、B与EDMD均呈负相关（r=-0.55和r=-0.61）。从速率曲线来看,降解速率曲线主要反映了b部分的降解情况,而饲料产气的速率曲线却能明显反映出两相的发酵情况。

英文摘要：

The experiments was designed to compare two methods between in situ nylon bag technique and in vitro gas production by evaluating the value of rapeseed meal, maize, rice bran, alfalfa, corn silage and corn stalk. From the parameters of two techniques, the effective degradation of DM （EDMD） of different feed were 52.90%, 54.27%, 65.70%, 40.76%, 37.24% and 38.17%, respectively. Part a was mostly accounted for the EDMD in concentrate （e.g. 64.51% for rice bran）. The asymptotic gas production per gram （A） of individual feeds were for forages were 105.00, 180.51, 109.30, 172.71, 147.76 and 148.66 mL, respectively. A for forages were higher than that of concentrates generally. The parameters of in vitro gas production （A and B） were both negatively correlative with EDMD（r = -0.55 and -0.61 ）. From the rate curve of two methods, the rate curve of rumen degradation only reflected the fermentation of part b, but that of gas production was evidently indicated more than the fermentation of two phases.