摘要
试验选用20只三月龄断奶二元杂交肉羊,采用随机区组试验设计,探讨瘤胃保护性色氨酸对肉羊氮代谢及生长性能的影响。瘤胃保护性色氨酸设四个添加水平,即0g/d、1.0g/d、2.0g/d和4.0g/d。结果表明,日粮中添加瘤胃保护性色氨酸能降低尿氮的排出量,提高氮沉积、日增重和氮的生物学利用率(P<0.05),但1.0g/d、2.0g/d和4.0g/d三个处理组之间比较差异不显著(P>0.05),在此试验条件下,日粮中瘤胃保护性色氨酸的适宜添加量为1.0g/d。
27 newly weaned three-month old cross-breed lambs were used to study the effect of rumen-protected Tryptophaa on nitrogen metabolism and production performance in lambs. The goats were randomly assigned to four treatments： 0g/d, 1.0g/d, 2.0g/d or 4.0g/d rumen-protected Tryptophan added to the concentrate diet. The results showed that rumen-protected Tryptophan supplementation decreased （P 〈 0.05） urinary nitrogen excretion and increased （P 〈 0.05） nitrogen retention, average daily gain （ADG） and the nitrogen biological value. However, there was no difference among treatments （P 〉 0.05）. The results indicated that the optimal rumen-protected Tryptophan supplementation under present experiment was 1.0 g/d.
关键词
瘤胃保护性色氨酸
肉羊
氮代谢
生长性能
rumen-protected Tryptophan
lambs
nitrogen metabolism
production performance
