膨化秸秆微生物发酵饲料对杜寒杂交肉羊生长性能和胃肠道发育的影响

目的] 研究膨化秸秆微生物发酵饲料对杜寒杂交肉羊生长性能和胃肠道发育的影响。方法] 选择81只3月龄、体重为（23.0±1.0）kg的杜寒杂交羔羊,随机分为对照组（70%精料+30%干秸秆）、试验Ⅰ组（70%精料+30%膨化秸秆微生物发酵饲料）和试验Ⅱ组（70%精料+30%膨化秸秆微生物发酵饲料,添加占日粮总蛋白浓度10%的膨化缓释尿素,NPN≥100%）。试验期为75 d,预饲期为15 d,正饲期为60 d。分析育肥羊的增重,胃肠道组织重量和表观形态。结果] 膨化秸秆微生物发酵饲料极显著（P<0.01）提高试验组羊的采食量和日增重。试验组羊的大肠重,消化道总重和瘤胃容积均显著（P<0.05）高于对照组,试验Ⅱ组羔羊瘤胃内壁颜色优于其他组。结论] 膨化秸秆微生物发酵饲料促进了育肥羊生长性能和胃肠道发育,试验Ⅱ组的作用更明显。

Effects of Microbial Fermented Expanded Straw Feed on Growth Performance and Gastrointestinal Tract Development of Dorper and Thin-tailed Han Crossbred Sheep

Objective] To investigate the effects of microbial fermented expanded straw feed on growth performance and gastrointestinal tract development of Dorper and Thin-tailed Han crossbred sheep. Method] A total of 81 3-month-old Dorper and Thin-tailed Han crossbred sheep weighing （23.0±1.0） kg were chosen and randomly assigned into the following three groups: control group （70% concentrate + 30% dry straw）, experimental group Ⅰ（70% concentrate + 30% microbial fermented expanded straw feed）, and experimental group Ⅱ （70% concentrate + 30% microbial fermented expanded straw feed, supplemented with expanded slow-release urea accounting for 10% of the total dietary protein concentration, NPN≥100%）. The experiment lasted for 75 days, with a 15-day pre-feeding period and a 60-day formal feeding period. The weight gain of the fattening sheep during the experiment was evaluated, and the gastrointestinal tract tissues were weighted and morphologically characterized. Result] The feed intake and daily weight gain in experimental groups Ⅰ and Ⅱ were extremely significantly （P<0.01） boosted by the microbial fermented expanded straw feed. The weight of the large intestine, the total weight of the digestive tract, and the rumen volume were significantly （P<0.05） increased in experimental groups Ⅰ and Ⅱ compared with those of control group. The color of the rumen internal wall was better in experimental group Ⅱ than that in the other groups. Conclusion] The microbial fermented expanded straw feed promotes the growth performance and gastrointestinal tract development of fattening sheep, with experimental group Ⅱ having a stronger effect.