对3种类型饲用作物杂交苏丹草皖草2号、墨西哥玉米和粮饲兼用玉米农大108进行了比较。结果表明，鲜、干物质产量以皖草2号最高，墨西哥玉米其次，农大108最低。皖草2号和墨西哥玉米叶片是干物质产量构成的主体，对农大108茎秆是主体。皖草2号粗蛋白(CP)、无氮浸出物(NFE)、酸性洗涤纤维(AWF)、粗脂肪(EE)、粗灰分(CA) 5大养分产量均显著高于墨西哥玉米和农大108，其粗蛋白和粗灰分含量均低于墨西哥玉米高于农大108。皖草2号总能量(GE)极显著高于墨西哥玉米和农大108，分别高出1 448.024×106 J·hm-2和2 339.687×106 J·hm-2。农大108干物质和粗蛋白降解率最高，分别为57.880%和12.424%。墨西哥玉米粗纤维的降解率显著高于皖草2号，但它们的干物质和粗蛋白降解率差异不显著。3种类型饲用作物营养价值差异来自其生物学特性的显著差异。
Three kinds of forage crop, Sudan Grass—Wancao2, Euchlaena perennis Hitchc. and ND108 which is also used as food were used to compare the nutritive composition. Both fresh matter yield and dry matter yield of Wancao2 was the highest, that of E. perennis the median, and ND108 the lowest relatively. Main component of dry weight was leaves in Wancao2 and E. perennis, while stems in ND108. The yields of crude protein(CP), nitrogen-free extract(NFE), acid-washed fiber (AWF), ether extract (EE) and crude ashes (CA) were higher in Wancao2 than in E. perennis and ND108 significantly, however, the content of CP and CA was the highest in E. perennis and the lowest in ND108. In addition, the total energy (GE) of Wancao2 was 1 448.024×106 J·hm-2 and 2 339.687×106 J·hm-2 higher than that of E. perennis and ND108, respectively. The degradation rate of dry matter and CP were the highest in ND108, which was 57.880% and 12.424%. The degradation rate of crude fiber was higher in E. perennis than in Wancao2. The differences of degradation rate of CP and dry matter between E. perennis and Wancao2 are not significant. In conclusion, the difference of nutrition among the three kinds of forage crops results from their different biological characteristics.
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