高寒牧区天然草地牧草干物质的瘤胃降解率动态变化

摘要

5 healthy sheep with similar weight and physics,installed with rumen fistula (German merino × small tail han sheep)were used to study the degradation dynamics of forage from alpine pasture in Maqu County during 2010 to 2012 through nylon bag method.The results showed that the forage dry matter degradation rate tended to be stable after 48 hours degradation in rumen.Along with the forage growth period,the dry matter degradation rate increased first and reached the peak values in July 2010,June 201 1 and June 2012 (67.05%,60. 9% and 71.56% respectively),and then decreased in August and September.The degradation rates of dry mat-ter of same forage varied among different years.%选用5只安装有瘤胃瘘管,体重和体质相近,健康无病的德国美利奴×小尾寒羊为试验羊只,采用瘤胃尼龙袋法测定2010~2012年不同月玛曲高寒草地天然牧草瘤胃降解率动态变化,结果表明,天然牧草在瘤胃中降解48 h 后其干物质瘤胃降解率趋于平缓。牧草瘤胃干物质降解率随生育期的推移先升高后降低,在6、7月出现了峰值,2010年7月,2011和2012年6月分别达到67.05%,60.9%和71.56%。此时牧草营养价值较高,完全可以满足家畜对营养素的需求,8、9月逐渐下降；不同年份相同草地牧草干物质降解率也不同。