棉桃壳和氨化棉桃壳对绵羊的营养价值评定

选用4只体重28 kg左右,安装永久瘤胃瘘管甘肃高山细毛羯羊,采用4×4拉丁方试验设计,通过体内消化代谢试验对棉桃壳和氨化棉桃壳进行营养价值评定。结果表明,绵羊对棉桃壳和氨化棉桃壳消化能、干物质消化率、氮消化率、有机物质消化率、中性洗涤纤维消化率、酸性洗涤纤维消化率、钙消化率、磷消化率和氮存留率分别为11.42 和10.90 MJ/kg,68.41%和66.30%,60.30%和60.68%,70.25%和67.57%,57.44%和54.55%,54.78%和52.21%,27.66%和24.88%,34.56%和27.57%及49.48%和50.34%。氨化棉桃壳和棉桃壳的消化率无显著性差异(P>0.05);饲粮中添加棉桃壳和氨化棉桃壳对绵羊瘤胃液中乙酸、丙酸、丁酸和其他酸摩尔比及乙/丙和氨态氮与蛋白氮浓度均产生了显著的影响(P<0.05),对瘤胃液pH及TVFA、总氮和尿素氮浓度无显著影响(P>0.05)。试验表明棉桃壳和氨化棉桃壳养分表观消化率无显著差异,利用尿素进行氨化处理时绵羊瘤胃内释放氨的速度较快,瘤胃微生物合成强度较低。

Nutritional evaluation of cotton shell and ammoniated cotton shell feed on sheep

Four Gansu Alpine sheep (average weight 28 kg) were fitted with permanent rumen fistulas in a 4×4 Latin square design experiment to investigate the nutritional evaluation of cotton shell and ammoniated cotton shell feed on sheep. Digestive energy, the digestibility of dry matter, nitrogen, organic matter, neutral detergent fiber, acid detergent fiber, calcium, phosphorus, N persistence of cotton shell and ammoniated cotton shell were 11.42 and 10.90 MJ/kg, 68.41% and 66.30%, 60.30% and 60.68%, 70.25% and 67.57%, 57.44% and 54.55%, 54.78% and 52.21%, 27.66% and 24.88%, 34.56% and 27.57%, 49.48% and 50.34%, respectively. After feeding cotton shell and ammoniated cotton shell to sheep, there were no significant differences in various digestion rates of nutrient digestibility. There were significant (P<0.05) differences in molar ratio of acetate, propionate, butyrate, other acids, the acetate/propionate ratio, and the concentration of protein nitrogen in ruminal fluid. There were no significant differences in pH, concentration of total volatile fatty acids, total nitrogen, or concentration of urea nitrogen. The nutrient digestibility of cotton shell and ammoniated cotton shell were not significantly different. However, an advantage of the urea ammoniated treatment was that the release of ammonia in the rumen of sheep was faster, and the microbial synthesis was of lower strength in the rumen.