本试验旨在研究饲粮中添加不同水平杜仲叶提取物对爱拔益加(AA)肉鸡生长性能与免疫功能的影响。选择健康1日龄AA肉鸡275羽,随机分为5个组,每组5个重复,每个重复11羽鸡。对照组饲喂基础饲粮,试验组分别在基础饲粮中添加0.05%、0.10%、0.15%、0.20%杜仲叶提取物。试验为期42 d。结果表明:1)各组平均日采食量差异不显著(P>0.05);与对照组相比,0.15%添加组在8~14 d的平均日增重提高了7.42%(P<0.05),0.05%、0.10%和0.15%添加组在29~35 d的平均日增重分别提高了26.13%、25.05%和24.94%(P<0.05);0.05%和0.15%添加组在29~35 d的料重比分别比对照组降低了21.15%、19.34%(P<0.05)。2)各组21、42 d肉鸡免疫器官指数、血清免疫球蛋白A含量差异均不显著(P>0.05);0.15%添加组21 d血清免疫球蛋白G含量比对照组提高了23.06%(P<0.05),0.05%、0.15%和0.20%添加组42 d血清免疫球蛋白M含量分别比对照组提高了118.89%、73.33%和71.11%(P<0.05)。由此可见,饲粮中添加一定水平的杜仲叶提取物可提高肉鸡免疫功能,改善生长性能,其中以0.15%的添加水平效果最好。

This experiment was conducted to investigate the effects of different Eucommia leaves extract level on growth performance and immune function of Arbor Acre (AA) broilers.A total of 275 one-day-old AA broilers were randomly divided into 5 groups with 5 replicates per group and 11 chickens per replicate. Broilers in the control group were fed a basal diet, and the other were fed the basal diets supplemented with 0.05%, 0.10%, 0.15% and 0.20% Eucommia leaves extract, respectively. The feeding trial lasted for 42 days. The results showed as follows: 1) there was no significant difference on the average daily feed intake among all groups (P>0.05). Compared with the control group, 0.15% supplemental group increased average daily gain (ADG) by 7.42% during 8 to 14 days (P<0.05), and 0.05%, 0.10% and 0.15% supplemental groups increased ADG by 26.13%, 25.05% and 24.94% during 29 to 35 days (P<0.05), and the feed to gain ratio of 0.05% and 0.15% supplemental groups decreased by 21.15% and 19.34% during 29 to 35 days (P<0.05). 2) There was no significant difference on immune organs index and serum immunoglobulin A content among all groups at 21 and 42 days (P>0.05). Compared with the control group, the serum immunoglobulin G content in 0.15% supplemental group increased by 23.06% at 21 days (P<0.05), and the serum immunoglobulin M content in 0.05%, 0.15% and 0.20% supplemental groups increased by 118.89%, 73.33% and 71.11% at 42 days (P<0.05).In conclusion, dietary supplemented with Eucommia leaves extract can improved growth performance and immune function of broilers, and the suitable supplemental level is 0.15%.