本试验旨在研究日粮碘添加水平对断奶至2月龄生长肉兔生长性能和血清生化指标的影响。选用80只平均体重为（780±50）g的35日龄断奶新西兰肉兔，随机分成4组（每组20个重复，每个重复1只兔），分别饲喂在基础日粮中添加0（对照）、0.1、0.5和2.5 mg/kg碘的试验日粮，预试期7 d，正试期23 d。结果表明：日粮碘添加水平对平均日增重（ADG）有显著影响（P<0.05），0.1和0.5 mg/kg组的ADG显著高于对照组（P<0.05）。日粮碘添加水平对料重比（F/G）有显著影响（P<0.05），0.5 mg/kg组的F/G显著低于对照组和0.1 mg/kg组（P<0.05）。日粮碘添加水平对血清常规生化指标影响不显著（P>0.05）。日粮碘添加水平对血清免疫球蛋白A（IgA）含量有显著影响（P<0.05），0.5 mg/kg组的IgA含量显著高于其他各组（P<0.05）。日粮碘添加水平对血清免疫球蛋白G（IgG）和免疫球蛋白M（IgM）含量无显著影响（P>0.05）。日粮碘添加水平对血清三碘甲腺原氨酸（T3）含量有极显著影响（P<0.01），随着碘添加水平的增加，T3含量先升高后降低，当碘添加量为0.5 mg/kg时T3含量达到最大值。日粮碘添加水平对血清四碘甲腺原氨酸（T4）含量的影响不显著（P>0.05）。综上所述，断奶至2月龄生长肉兔日粮中碘适宜添加量为0.5 mg/kg（基础日粮碘含量为0.22 mg/kg）。

This trial was conducted to study the effects of dietary iodine supplementation levels on growth performance and serum biochemical indices of growing meat rabbits from weanling to 2-month-old. Eighty 35-day-old weanling New Zealand rabbits with average body weight of (780±50) g were randomly assigned to 4 groups with 20 replicates per group and 1 rabbit per replicate. The rabbits in 4 groups were fed basal diet supplemented with 0 (control), 0.1, 0.5 and 2.5 mg/kg iodine, respectively. The trial lasted for 7 days for adaptation, and 23 days for test. The results showed as follows: dietary iodine supplementation levels significantly affected average daily gain (ADG) (P<0.05) and the ADG in 0.1 and 0.5 mg/kg groups was higher than that in control group (P<0.05). The feed/gain (F/G) was significantly affected by the dietary iodine supplementation levels (P<0.05) and the F/G in 0.5 mg/kg group was lower than that in control group and 0.1 mg/kg group (P<0.05). The serum routine biochemical indices were not significantly affected by the dietary iodine supplementation levels (P>0.05). Dietary iodine supplementation levels significantly affected serum immunoglobulin A (IgA) content (P<0.05) and the IgA content in 0.5 mg/kg group was higher than that in other groups (P<0.05). The serum immunoglobulin G (IgG) and immunoglobulin M (IgM) contents were not significantly affected by dietary iodine supplementation levels (P>0.05). Dietary iodine supplementation levels significantly affected serum triiodothyronine (T3) content (P<0.01). With the increase of the iodine supplementation levels, the T3 content was increased firstly and then decreased, and the highest T3 content was found in 0.5 mg/kg group. There was no significant difference in serum tetraiodothyronine (T4) content among different groups (P>0.05). In conclusion, the appropriate iodine supplementation level in the diet of growing meat rabbits from weanling to 2-month-old was 0.5 mg/kg (the content of iodine in basal diet was 0.22 mg/kg).［Chinese Journal of Animal Nutrition, 2010，22（4）:1076-1080］