峪口“京红1号”父母代种鸡育雏期赖氨酸需要量的研究

Lysine requirement of parental Yu Kou BrownⅠat brooding period

研究旨在评定峪口＂京红1号＂父母代蛋种鸡育雏前期（0~2周）和育雏后期（3~6周）赖氨酸需要量。选取1日龄和15日龄＂京红1号＂父母代种鸡各1 080只,随机分成3个处理,每个处理5个重复,每个重复72只鸡,饲喂玉米-豆粕-玉米蛋白粉型基础日粮,配制日粮使0~2周各处理组赖氨酸水平分别为0.95%、1.10%、1.25%,3~6周各处理组赖氨酸水平为0.90%、1.00%和1.10%,记录试验期间生产性能数据。结果表明：0~2周赖氨酸水平为1.25%组的4周龄平均日增重显著高于0.95%组（P〈0.05）,而赖氨酸水平为1.10%组的3周龄体重均匀度显著高于0.95%处理组（P〈0.05）,且料肉比显著低于0.95%处理组和1.25%处理组（P〈0.05）。3~6周赖氨酸水平为1.00%组4周龄时的料肉比显著低于0.90%和1.10%处理组（P〈0.05）,对其它生产指标无显著性影响。综上,＂京红1号＂父母代蛋种鸡0~2周龄和3~6周龄适宜赖氨酸需要量分别为1.10%和1.00%。

This study was conducted to determine the lysine requirement of Yu Kou Brown Ⅰ parentstock at 0~14 and 15~42 days of age. A total of 1 080 1-day-old chickens and 1 080 15-day-oldchickens were randomly allocated into 3 groups（5 replicates, 72 chickens for each relicate）. Corn-soy-bean meal-corn gluten meal diets were used. Three lysine levels were 0.95%, 1.10%, 1.25% at 0~14days, three lysine levels at 15~42 days were 0.90%, 1.00%, 1.10%. Growth performances of chickenswere determined. The results showed that the average daily gain was significantly higher than that in0.95% lysine group when the level of lysine was 1.25% in 0~2 weeks. But when the level of lysinewas 1.10% in 3 weeks, the uniformity and feed conversion ratio were significantly higher than that in0.95% lysine group. When the lysine level was 1.00% in 3~6 weeks, the feed conversion ratio was sig-nificantly lower than those in 0.95% and 1.10% lysine group, but the other performance showed no sig-nificant difference. In conclusion, the lysine requirement of Yu Kou BrownⅠparent stock at 0~14 and15~42 days of age was 1.10% and 1.00% respectively.