本试验旨在研究饲粮中添加绿狐尾藻对武鸭生长性能、屠宰性能和免疫器官指数的影响，以确定绿狐尾藻在临武鸭饲粮中适宜添加水平。选用30日龄健康、体重相近的临武鸭480只，随机分为3组，每组设4个重复，每个重复40只。1组（对照组）饲喂基础饲粮，2组、3组分别饲喂含10%、20%绿狐尾藻的试验饲粮。试验期28 d。44和58日龄时进行屠宰，测定活体重、屠体率、半净膛率、全净膛率、胸肌率、腿肌率、皮脂率和免疫器官指数。结果表明，1）30~44日龄和45~58日龄，3组的平均日增重、平均日采食量和料重比与2组、对照组相比均显著提高（P<0.05），但2组与对照组之间无显著差异（P>0.05）。2）44和58日龄，各组之间活体重、屠体率、半净膛率、全净膛率、腿肌率和皮脂率均无显著差异（P>0.05），2组、3组胸肌率均显著高于对照组（P<0.05）。3）44日龄，各组之间胸腺指数、脾脏指数和法氏囊指数均无显著差异（P>0.05）；58日龄，3组法氏囊指数显著高于对照组（P<0.05），3组脾脏指数显著高于对照组、2组（P<0.05），各组之间胸腺指数无显著差异（P>0.05）。由此可见，临武鸭饲粮中添加10%的绿狐尾藻，对生长性能、屠宰性能和免疫器官指数无明显影响。

This study was conducted to investigate the effects of dietary Myriophylium elatinoides on growth performance, slaughter performance and immune organ indexes of Linwu ducks, and to find the suitable supplemental level of Myriophylium elatinoides in Linwu ducks diet. A total of 480 thirty-day-old Linwu ducks with similar body weight were randomly divided into three groups with four replicates per group and forty ducks per replicate. Ducks in group 1 (control group) fed a basal diet, and the others in the groups 2 and 3 were fed the experimental diets which contained 10% and 20% Myriophylium elatinoides, respectively. The experiment lasted for 28 days. Ducks were killed at 44 and 58 days of age to investigate body weight, carcass rate, half-eviscerated rate, eviscerated rate, breast muscle rate, leg muscle rate, subcutaneous fat rate and immune organ index. The results showed as follows:1) at 30 to 44 days of age and 45 to 58 days of age, the average daily gain, average daily feed intake and the ratio of feed to gain of group 3 were significantly higher than those of group 2 and control group (P<0.05), and there were no significant differences between group 2 and control group (P>0.05). 2) At 44 and 58 days of age, there were no significant differences in body weight, carcass rate, half-eviscerated rate, eviscerated rate, leg muscle rate and subcutaneous fat rate among all groups (P>0.05), and the breast muscle rate of groups 2 and 3 was significantly higher than that of control group (P<0.05). 3) At 44 days of age, there were no significant differences in thymus index, spleen index and bursa of Fabricius index among all groups (P>0.05). At 58 days of age, the bursa of Fabricius index of group 3 was significantly higher than that of control group (P<0.05), the spleen index of group 3 was significantly higher than that of control group and group 2 (P<0.05), but there was no significant difference in thymus index among all groups (P>0.05). In conclusion, dietary supplemented with 10% Myriophylium elatinoides has no obvious effect on growth performance, slaughter performance, and immune organ indexes of Linwu ducks.