【摘要】 选用 9只 2周岁左右的装有永久性瘤胃瘘管和十二指肠近端瘘管的内蒙古白绒山羊羯羊 ,研究同一硫源(硫酸钠 )、同一氮硫比 (7 6 0 :1)条件下 ,3种不同蛋白水平的日粮对内蒙古白绒山羊营养物质消化代谢的影响。试验结果表明 :(1)Ⅱ组 (CP为 9 41% )干物质进食量、沉积氮显著高于Ⅰ组 (CP为 7 14% )和Ⅲ组 (CP为 10 77% )(P <0 0 5 )。Ⅱ组和Ⅲ组氮的表观消化率显著高于Ⅰ组 (P <0 0 5 )。研究发现当日粮粗蛋白为 8 87% ,硫水平为0 186 %时 ,沉积氮可获最佳值 4 17(g/d)。 (2 )硫的沉积量以Ⅱ组最高 ,显著高于其它两组 (P <0 0 5 )。各组间硫的表观消化率无显著差异 (P >0 0 5 )。研究发现当日粮粗蛋白水平为 8 78%时 ,硫的沉积量可以获得最佳值0 337g/d。 (3)Ⅱ组和Ⅲ组的瘤胃总氮流量以及十二指肠总氮流量均显著高于Ⅰ组 (P <0 0 5 )。Ⅱ组瘤胃微生物氮显著高于Ⅰ组和Ⅲ组 (P <0 0 5 )。Ⅱ组和Ⅲ组十二指肠微生物氮显著高于Ⅰ组 (P <0 0 5 )。Ⅱ组瘤胃总硫流量显著高于Ⅰ组和Ⅲ组 (P <0 0 5 )。十二指肠总硫流量各组间没有显著差异 (P >0 0 5 )。更多还原

【Abstract】 9 castrated male Inner Mongolian White Cashmere Goats(two years old)with permanent ruminal and duodenal cannulas were used to study the effects of different protein levels in the diets containing the same sulfur sources(sodium sulfate)and the same nitrogen to sulfur ratio(7.60∶1),on the nutrients digestion and metabolism.The results showed as follows:Retained nitrogen and sulfur of group Ⅱ(CP 9.41%)were higher than that of group Ⅰ(CP 7.14%)and group Ⅲ(CP 10.77%)(P<0.05).The total ruminal nitrogen flow and digesta nitrogen flow into the duodenum of group Ⅱ and group Ⅲ were higher than those of group Ⅰ(P<0.05).Ruminal microbial nitrogen of group Ⅱ were higher than that of group Ⅰ and group Ⅲ(P<0.05).Microbial nitrogen flow into duodenum of group Ⅱ and group Ⅲ were higher than that of group Ⅰ(P<0.05).Ruminal total sulfur flow of group Ⅱ were higher than that of group Ⅰ and group Ⅲ(P<0.05),but the total sulfur flow into the duodenum of different groups had no difference(P>0.05).The optimal N retention was 4.17(g/d)and the optimal S retention was 0.337(g/d)when CP in the diet was 8.87% and sulfur was 0.186%.So the optimal feeding level of IMWCG(two-year-old)was a little higher than the maintaining level.更多还原