Providing theoretical evidence for the application of microecologics. The crossbreed of Suffolk sheep (male) and Small Tail Han sheep (female) at 90 ± 6 day old and with 31.8 ± 2.8 kg were included in the test. Totally 120 sheep were divided into 3 groups (non-fattened group, fattened group1 and group2) and fattened for 60 days including 7 days pre-fattening. The non-fattened sheep were fed with dry corn straw and wheat straw while the fattened group 1 and 2 were fed respectively with tanning crushed corn straw silage and corn straw silage fermented with 0.5% microecologics. compared to the non-fattened control (an average of 10.8 kg increase in weight), the fattened group 1 and group 2 showed a significant increase in their weight with an average of 14.9 kg (P< 0.05) and 17.8 kg (P< 0.01), respectively. the crossbreed of Suffolk sheep and Small Tail Han sheep showed relative high productivity as a result of feeding with microecologics. Moreover, the usage rate of fodder was also increased by microecologics suggesting that it can be worthy to applicate.%为应用微生态制剂进行肉羊舍饲育肥提供理论支撑，本试验以萨福克公羊与小尾寒羊母羊杂交一代为试验对象，随机选取日龄（90±6日龄）、体重（31.8±2.8 kg）相近的120只个体，分3个试验组，每组40只，进行为期60 d的育肥试验，其中预饲期为7 d。对照组粗饲料为粉碎的干玉米秸秆和麦草；试验Ⅰ组饲喂鞣制粉碎的青贮玉米秸秆；试验Ⅱ组饲喂经过微生态制剂发酵处理鞣制粉碎的青贮玉米秸秆，微生态制剂的添加量为青贮料重量的0.5%。经过60 d的育肥试验，对照组体重增加10.8 kg/只，试验Ⅰ组增加14.9 kg/只，试验Ⅱ组羊只体重增加17.8 kg/只。其中，试验Ⅰ组的日增重显著高于对照组（P＜0.05），试验Ⅱ组的日增重极显著高于和对照组试验Ⅰ组（P＜0.01）。试验Ⅱ组的屠宰率和净肉率显著高试验Ⅰ组和对照组（P＜0.05）。在育肥过程中，经过微生态制剂与青贮玉米秸秆发酵后的日粮，饲喂萨福克与小尾寒羊的杂交一代，可以提高育肥羊只对饲料的利用效率，同时可以改善育肥羊只的生产性能，在实际生产中具有较大的推广意义。
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