【摘要】 选用 5只 10月龄装有永久性瘤胃瘘管的绵羊 ,按 5× 5拉丁方试验设计 ,研究了 5种不同处理的日粮对绵羊瘤胃消化代谢的影响。通过对瘤胃液pH值、氨态氮、尿素氮浓度的测定结果表明 ,以尿素部分替代混合日粮中的豆粕作为蛋白源 ,瘤胃液pH值、氨态氮等生理指标均处于正常范围。经包被处理的缓释尿素 ,食后 0 .5h时瘤胃中氨态氮的释放速度低于直接添加尿素组 ;以聚乙烯醇 (PVA)包被的尿素 ,食后 0 .5h时瘤胃液尿素氮浓度高于其它处理组。从而初步证明尿素经包被处理可在某种程度上减缓释氨速度更多还原

【Abstract】 In a 5×5 Latin Squire experiment design,five sheep with rumenfistula were used to study the effect of different treated rations on the digestion and metabolite in the rumen.The dynamic changes of pH values,concentrations of NH 3-N and urea-N in the rumen fluid were measured respectively.The results indicated that pH values and NH 3-Nconentrations of rumen fluid were in the range of normal physiology for the rumen microorganism when the soybean neal in the ration was replaced partly by the urea;The releasing rate of ammonia in the slowly-released urea was lower than that of uncovered urea(P<0.05);the slowly-released urea coated with polyvinylalcohol(PVA)affected urea-Nconcentrations of the rumen fluid,which in 0.5 hour after intake were increased significantly(P<0.05).The refore,it was practicable that slowly-released urea decreased releasing rate of ammonia in the rumen.更多还原