不同日粮能量浓度对反刍动物能量降解率影响的研究

A STUDY OF THE EFFECTS OF VARIOUS ENERGY CONCENTRATIONIN DIETS ON THE RATE OF ENERGY DEGRADATION FOR RUMINANT

取３只装有永久性瘤胃瘘管的小尾寒羊进行瘤胃消化代谢试验，按３×３拉丁方试验设计，喂给３种日粮，代谢能浓度（ＭＪ．ｋｇ－１ＤＭ）分别为：高浓度组（ＨＤ）１１．３２、低浓度组（ＬＣ）１０．４４和中浓度组（ＭＣ）１１．０１；粗蛋白含量１３．７５％。试验结果表明，豆饼外流速度为０．０３３３ｈ－１且个体因素带来的差异大于日粮因素带来的差异；不同能量浓度的日粮对尼龙袋内３６ｈ后能量降解率影响显著（Ｐ＜０．０５），对粗蛋白质影响不显著（Ｐ＞０．０５）；日粮能量动态降解率与食入代谢第水平负相关与粗蛋白质食入水平正相关：Ｙ＝６０．１５—１０．４２Ｘ１＋８．３０Ｘ．（Ｒ２＝０．７００８，Ｐ＜０．０１）；反刍动物饲养制度应根据日粮组成进行调整，含精料高日粮可采取先精后粒饲喂顺序，精料型日粮队注意提供足够可消化碳水化合物外，可采取精粉混饲方式。

Three wether hogg little-fat-tail Han sheep with ruminal cannula wereused for rumen digestion experiments in 3×3 design (average weight was 28. 3±3.8kg). The animals were fed with three diets, the metabolizable energy concentrationMJ. kg-1DM) of which were like these: 11. 32. 10. 44 and 11. 01 respectively for thehigher concentration group (HC), the lower (LC)and the middle (MC), and the proteinconcentration was 13. 75%. The experiment showed that the rate of soybean mealflowed out of rumen was 0.0333h-1 which was affected by animal more than diets.Thevarious energy concentration of diets affected very significantly(p<0. 05) energy degradation in nylon bag after 36 hours of digestion but not so much for protein degradation(p<0.05). The dynamic degradation of diet energy was negative with the level of metabolizable energy intake and positive with protein intake (R2<,p<0.01):Y= 60.15-10.42x1+8.30x2. The ruminal feeding institution must be adjusted by the diet type,for example: If it was the concentrated feed type,the concentrates should be supplyed to theanimal first and the roughage second;If it was the coarse type,the concentrates andcoarse might be supplyed at the same time.