不同无机硫对内蒙古白绒山羊消化代谢的影响

选用9只装有瘤胃和十二指肠近端瘘管的内蒙古白绒山羊羯羊（2周岁左右），随机分成3组，分别饲喂氮硫比相同而硫源不同（分别为硫磺，硫化钠和硫酸钠）的3种日粮，进行消化代谢试验和测定食糜流通量，以探讨不同无机硫对氮和硫的沉积量以及硫的流通规律，试验结果表明：硫酸钠组氮的进食量和沉积量均显著高于硫磺组和硫化钠组（P＜0．05），但各组间氮的表观消化率差异不显著（P＞0．05），硫化钠组和硫酸钠组硫的沉积量以及表观消化率均显著高于硫磺组（P＜0．05），硫酸盐在瘤胃吸收量很少，主要在肠道被吸收；硫化物在瘤胃和小肠均可被吸收利用，元素硫（硫磺）主要在瘤胃和小肠前段被分解利用，元素硫的生物学效价显著低于硫酸钠和硫化钠（P＜0．05）。总之，添加硫酸钠对内蒙古白绒山羊的效果好于硫磺和硫化钠。

Effects of Different Inorganic Sulfur Sources on Nutrient Digestion and Metabolism in Inner Mongolian White Cashmere Goat

Nine Inner Mongolian White Cashmere Goat wethers aged two years old and installed with permanent ruminal and duodenal cannulas, were used to study the effects of different inorganic S sources (sulfur, sodium sulfide and sodium sulfate) on S flux and retention of N and S. The results showed that N intake and retention were higher for sodium sulfate group than those of sulfur group and sodium sulfide group ( P <0.05), but there was no significant difference( P >0.05) in apparent digestibility of N among the three treatments . S retention and apparent digestibility were significantly lower for sulfur group than those of sodium sulfide group and sodium sulfate group ( P <0.05). Sodium sulfate was absorbed mainly in the intestine, whereas sulfide was absorbed and utilized both in the rumen and intestine. Sulfur were mainly digested and availed in the rumen and the duodenum. Biological value of S was lower than that of sodium sulfate and sodium sulfide ( P <0.05). The present results suggest that sodium sulfate is a good source of S used as a supplement in the diets of Inner Mongolian White Cashmere Goats compared with sulfur and sodium sulfide.