0～4周龄京红1号蛋鸡饲粮赖氨酸需要量研究

Studies on Dietary Lysine Requirement of Jinghong Laying Hens from Hatch to the Age of 4 Weeks

旨在研究中国自主培育的京红1号蛋雏鸡（0～4周龄）饲粮赖氨酸需要量。本研究选取300只体重相近、健康的1日龄京红1号商品蛋雏鸡,采用单因素完全随机试验设计,随机分5个处理,饲粮赖氨酸水平分别为1.00%、1.10%、1.20%、1.30%和1.40%,每处理5个重复,每重复12只鸡。试验期4周。结果表明：1.20%Lys组蛋雏鸡平均日增重为8.17g·d-1,显著高于1.00%、1.30%和1.40%Lys组（P〈0.05）;1.20%Lys组的4周龄蛋雏鸡体重为265.70g,显著高于1.00%、1.30%和1.40%Lys组（P〈0.05）。1.20%Lys组的胰腺重量显著高于其他组（P〈0.05）。1.20%Lys组的空肠指数最小（1.71%）,显著低于1.00%Lys组（P〈0.05）,且空肠相对长度显著大于其他组（P〈0.05）。1.20%和1.30%Lys组的回肠指数显著低于1.00%、1.10%和1.40%Lys组（P〈0.05）;1.20%Lys组的回肠相对长度显著大于1.00%、1.10%和1.40%Lys组（P〈0.05）。1.20%Lys组4周龄蛋雏鸡的体重、屠体重及全净膛重均显著高于其他组（P〈0.05）。1.20%Lys组蛋雏鸡的心、肺重量显著大于其他组（P〈0.05）;1.20%Lys组蛋雏鸡的肾重量显著大于1.00%、1.30%和1.40%组（P〈0.05）;1.10%、1.20%及1.30%Lys组的肝重量显著大于其他组（P〈0.05）,且胫长显著大于1.00%Lys组（P〈0.05）。1.10%和1.20%Lys组蛋雏鸡的胸宽显著大于其他组（P〈0.05）。1.30%Lys组蛋雏鸡的脾脏指数（0.290%）显著高于1.00%和1.10%组,1.30%Lys组的法氏囊指数（0.543%）显著高于1.00%组（P〈0.05）。1.10%和1.20%Lys组的血清尿酸（UA）含量显著低于1.00%和1.40%Lys组（P〈0.05）。根据群体均匀度、4周龄鸡体重、平均日增重、屠体重、心、肝、回肠指数、回肠长度及血清UA含量等指标各自拟合二次曲线,最适宜Lys水平分别为1.145%、1.158%、1.155%、1.154%、1.151%、1.155%、1.189%、1.204%和1.142%。饲粮最佳Lys平均水平为1.161%。综合生长性能、屠体指标、器官指数及血清生化等方面的指标,推荐0～4周龄京红1号蛋雏鸡饲粮赖氨酸水平为1.16%。

The study was conducted to investigate the effect of dietary lysine（Lys）levels on growth performance and organ development of Jinghong laying hens,and to estimate the optimal dietary lysine requirement of Jinghong laying hens aged from hatch to the age of 4weeks.A total of 300 1-day-old Jinghong laying hens were randomly allotted to 5groups with 5replicates per group and 12 hens per replicates.Lys was added to the basal diet to obtain the Lys level at1.00%,1.10%,1.20%,1.30% and 1.40%,respectively.The trial lasted 4 weeks.The results showed as follows：The average daily gain in the 1.20% Lys group was significantly higher than that in 1.00%,1.30% and 1.40% Lys groups（P 〈0.05）;The body weight at 4 weeks in the1.20% Lys group was significantly higher than that in 1.00%,1.30% and 1.40% Lys groups（P 〈0.05）.The pancreas weight in the 1.20% Lys group was significantly higher than that in the other groups（P 〈0.05）.The jejunum index in the 1.20% Lys group was significantly lower than that in the 1.00% Lys group,and the jejunum relative length in the 1.20% Lys group was significantly higher than that in the other groups（P 〈0.05）.The ileum index in 1.20%and 1.30% Lys groups were significantly lower than that in 1.00%,1.10% and 1.40% Lys groups（P 〈0.05）,while the ileum relative length in 1.2% Lys group was significantly higher than that in 1.00%,1.10% and 1.40% Lys groups（P 〈0.05）.The body weight,carcass weight and eviscerated carcass weight in the 1.20% Lys group at the age of 4weeks were significantly higher than that in the other groups（P 〈0.05）.Birds fed 1.20% Lys had significantly higher heart weight,lung weight than that in the other Lys groups.The kidney weight in the 1.20% Lys group was significantly higher than that in 1.00%,1.30% and 1.40% Lys groups（P 〈0.05）.Liver weight in1.10%,1.20% and 1.30% Lys groups were significantly higher than that in the other groups（P 〈0.05）,and the shinbone length were significantly higher than that in 1.00% Lys group（P 〈0.05）.Birds fed 1.10%and 1.20% Lys had significantly higher chest width than that in the other Lys groups（P 〈0.05）.The spleen index（0.290%）and bursa of fabricius index（0.543%）in the1.30% Lys group were significantly higher than that in the 1.00% Lys group（P 〈0.05）.Hens fed 1.10%and 1.20% Lys had significantly lower serum uric acid content than that in 1.00%and1.40% Lys groups（P 〈0.05）.According to the quadratic regression analysis based on community evenness,body weight,average daily gain,carcass weight,heart weight,liver weight,ileum index,ileum relative length and uric acid content,the optimal dietary levels of Lys for Jinghong laying hens were 1.145%,1.158%,1.155%,1.154%,1.151%,1.155%,1.189%,1.204% and1.142%,respectively.The optimal averaged Lys levels was 1.161%.These results indicate that addition of appropriate Lys level in diet can promote growth performance and organ development.The optimal Lys level in diet of Jinghong laying hens from hatch to the age of 4weeks is 1.16%.