尿素水平对青山羊血液生化指标的影响

应用饲养试验与氮平衡试验,研究了不同尿素水平的日粮对青山羊血清总蛋白(STP)、血清清蛋白(ALB)、血清球蛋白(GLB)、血清清球蛋白比值(A/G)、血清尿素氮(SUN)及血清谷丙转氨酶的含量变化的影响。试验采用4×4拉丁方试验设计,试验分4个阶段,在基础日粮一致的情况下,采用4、9、14、0(对照)g/kg·DM4种不同的处理,试验结果表明:不同尿素水平极显著影响ALB、SUN浓度和GPT活性浓度(P<0.01),对血清清球比(A/G)无显著差异(P>0.05),尿素水平与STP、GLB浓度存在负相关;血清含氮生化指标STP、ALB、GLB、A/G、GPT、SUN随时间呈动态变化,出现高峰的时间比瘤胃氨浓度出现的时间平均推迟1～2h。进食尿素后,血液生化指标由平稳逐渐缓慢升高到高峰,随后又下降并趋于平衡。

Effects of different levels urea on blood biochemical indices in green goats

The experiment was conducted by feeding and nitrogen balance trials, the effects of urea levels in the diets on the serum total protein(STP)、albumin(ALB) globulin(GLB)、albumin and globulin ratio(A/G)、serum urea nitrogen(SUN)and glutamate-pyruvate transaminase(GPT) in the serum of green goats was studied.four factors of different urea levels which were 4g/kg·DM、9g/kg·DM、14g/kg·DM、0g/kg·DM (the Contro1)in same based diet.The results were as fl1lows:The concentration of ALB and SUN and the activity of GPT were affected significantly by different urea levels (P<0.01),but A/G was not(P>05).The STP and GLB 1evels were negatively correlated to urea levels in diets but no significant difference was found.The high concentration is later 1～2h than the time that rumen ammonia concentration appears. The blood biochemical indices increases slowly to the top and then goes to placidity.