Four Corriedale sheep fitted with rumen cannula and T shaped duodenum cannula were used to detemine the degradability of diet RNA in rumen by in sacco and in vivo under different diet level.

• 利用 4只装有瘤胃瘘管和十二指肠 T型瘘管的考力代绵羊 ,饲喂不同粗精比的饲料 ,采用 in sacco和 in vivo法测定了瘤胃饲料 RNA降解率 ,同时利用微生物体固有的 RNA为标记物 ,对瘤胃内未降解的饲料 RNA量换算成瘤胃微生物合成量的影响进行了研究。