本试验旨在研究饲粮添加不同水平硒对生长期(5～11周)蛋鸭生长性能、免疫机能及内分泌的影响。试验选用5周龄、平均体重为(0.36±0.01) kg的金定蛋鸭150只，采用单因素试验设计，随机分为5个组，每组6个重复，每个重复5只鸭，分别饲喂在基础饲粮（硒含量0.04 mg/kg）中添加0（对照组）、0.08、0.16、0.36和0.66 mg/kg硒（实际添加物为亚硒酸钠）的试验饲粮，试验期为7周。结果表明：1)饲粮中添加0.08和0.16 mg/kg硒可显著提高蛋鸭平均日增重，降低料重比(P<0.05)。2)与对照组相比，0.08 mg/kg硒添加组的脾脏鲜重、法氏囊鲜重及法氏囊指数显著升高(P<0.05)，0.08和0.16 mg/kg硒添加组的血清白细胞介素-2（IL-2）含量显著升高(P<0.05)。硒水平对脾脏指数、胸腺指数及胸腺鲜重以及血清总蛋白(TP)含量的影响差异不显著(P>0.05)。3)血清三碘甲状腺原氨酸（T3）含量随硒水平的升高呈先升高后降低的趋势，而四碘甲状腺原氨酸（T4）含量则随硒水平的升高呈先降低后升高的趋势，但各组间差异均不显著(P>0.05)。饲粮添加0.16 mg/kg硒时，血清生长激素（GH）含量显著高于对照组和0.66 mg/kg硒添加组(P<0.05)。综合分析，添加0.08～0.16 mg/kg硒可提高生长期蛋鸭的生长性能和免疫机能，调节相关激素分泌。
The experiment was conducted to study the effect of different levels of dietary selenium (Se) on growth performance, immune function and endocrine of growing laying ducks (5 to 11 weeks). One hundred and fifty 5-week-old Jinding laying ducks with average body weight of (0.36±0.01) kg were chosen and randomly divided into 5 groups with 6 replicates per group and 5 ducks per replicate. The ducks in the 5 groups were fed basal diets (Se content was 0.04 mg/kg) supplemented with 0 (control group), 0.08, 0.16, 0.36 and 0.66 mg/kg Se (actual additives was sodium selenite), respectively. The trial lasted for 7 weeks. The results showed as follows: 1)supplemented with 0.08 and 0.16 mg/kg Se in diets significantly improved average daily gain, and reduced the ratio of feed to gain (P<0.05). 2) Compared with the control group, the fresh weight of spleen and Fabricius bursa, and index of Fabricius bursa in the group with the diet containing 0.08 mg/kg Se, and the interleukin-2 (IL-2) content in the two groups with the diet containing 0.08 and 0.16 mg/kg Se, respectively, were significantly increased (P<0.05), while the indices of spleen and thymus, fresh weight of thymus and serum total protein (TP) content were not influenced by different levels of Se (P>0.05). 3) With increasing Se levels, serum triiodothyronine (T3) content was firstly increased and then decreased , while the serum thyroxine (T4) content was firstly decreased and then increased, but no significant differences were found among all groups (P>0.05). The serum growth hormone (GH) content in the group with the diet containing 0.16 mg/kg Se was higher than that in the control group and the group with the diet containing 0.66 mg/kg Se (P<0.05). It is concluded that supplementation of Se from 0.08 to 0.16 mg/kg in diets can improve growth performance and immune function, and regulate related hormone secretion of growing laying ducks.［Chinese Journal of Animal Nutrition, 2011, 23（10）：1697 -1702］
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