日粮色氨酸水平对0～4周龄泰和乌骨鸡生产性能的影响

Effects of Dietary Tryptophan Levels on Performance of 0～4-week-old Taihe Silky Fowls

研究了色氨酸水平分别为0．133％、0．171％和0．209％的日粮对0～4周龄泰和鸟鸡生产性能的影响。结果表明，在0～2周龄，日粮色氨酸水平对各组日增重无显著影响（P〉0．05），但显著影响料重比（P〈0．01）和日采食量（P〈0．05）；0．133％组料重比（P〈0．01）和日采食量（P〈0．05）显著高于0．171％和0．209％组。在3～4周龄，三组间平均日采食量和料重比无显著差异（P〉0．05），但色氨酸水平显著影响日增重（P〈0．05），0．171％组日增重显著高于0．133％（P〈0．05），但与0．209％组差异不显著（P〉0．05）。综合0～4周龄数据分析表明，日粮色氨酸水平显著影响0—4周龄泰和乌骨鸡日增重（P〈0．05）、料重比（P〈0．01）和日采食量（P〈0．01）。综合考虑各项指标，对于粗蛋白水平为17．41％、代谢能为12．16MJ／kg的玉米一花生粕型低蛋白日粮，日粮适宜色氨酸水平为0．171％。

This paper studied the effects of dietary tryptophan levels （0. 133%, 0. 171% and 0. 209% ） on the performance of 0 4 - week - old Taihe silky fowls, and determined the optimum dietary tryptophan level. The results indicated that average daily gain （ADG） was not significantly influenced （ P 〉 0.05）, but the ratio of feed to gain （F/G） （ P 〈 0. 01 ） and average daily feed intake （ADFI） （P 〈0.05） were markedly affected by dietary tryptophan levels at the age of 0 -2 weeks, in which the F/G and ADFI of 0. 133% group were markedly higher than those of 0. 171% and 0. 209% groups （P 〈0. 01 and P 〈0.05, respectively）. At the age of 3 - 4 weeks, no significant difference in F/G and ADFI was found between all groups （ P 〉 0.05 ）, but the ADG （ P 〈 0.05 ） was signif- icantly influenced by dietary tryptophan levels, in which the ADG of 0. 171% group was significantly higher than that of 0. 133% group （P 〈0.05）, but no significant difference in ADG was observed between 0. 171% and 0.209% group （P 〉0.05）. AT the age of 0 - 4 weeks, the ADG （ P 〈 0.05）, F/G （ P 〈 0.01 ） and ADFI （ P 〈 0.05 ） were significantly influenced by dietary tryptophan levels. Based on all the results obtained, the optimum dietary tryptophan level （0.171% ） was recommended for 0 -4 -week -old Taihe silky fowls when they were fed by corn -peanut meal diets in which the crude protein content and metabolic energy level were 17.41% and 12.16 MJ/kg respectively.