本试验旨在研究饲粮中添加腐殖酸钠对肉仔鸡生长性能、免疫功能和抗氧化能力的影响。选择1日龄健康爱拔益加（AA）肉仔鸡600只，随机分为5组，分别为抗生素对照组（T1）、无抗对照组（T2）和0.1%（T3）、0.3%（T4）、0.5%腐殖酸钠添加组（T5），每组12个重复（公母各6个重复），每个重复10只鸡。试验分2个阶段进行，1~21日龄为试验前期，22~42日龄为试验后期。结果表明：1）1~21日龄时，抗生素对照组和0.3%腐殖酸钠添加组公鸡的平均日增重显著高于0.1%和0.5%腐殖酸钠添加组（P<0.05）。2）饲粮添加腐殖酸钠对42日龄肉鸡的屠宰率、半净膛率、全净膛率、胸肌率、腿肌率和腹脂率均无显著影响（P>0.05）。3）42日龄时，抗生素对照组公鸡的脾脏指数和母鸡的胸腺指数显著高于无抗对照组和0.1%腐殖酸钠添加组（P<0.05）。4）21日龄时，0.3%和0.5%腐殖酸钠添加组肉仔鸡的血清免疫球蛋白A（IgA）和免疫球蛋白G（IgG）含量显著高于抗生素对照组和无抗对照组（P<0.05）；0.5%腐殖酸钠添加组的血清免疫球蛋白M（IgM）含量显著高于其他组（P<0.05）。42日龄时，0.5%腐殖酸钠添加组肉仔鸡的血清IgA和IgM含量显著高于其他组（P<0.05）。5）21日龄时，0.3%和0.5%腐殖酸钠添加组肉仔鸡的血清丙二醛（MDA）含量显著低于抗生素对照组、无抗对照组和0.1%腐殖酸钠添加组（P<0.05）；而血清总抗氧化能力（T-AOC）显著高于抗生素对照组、无抗对照组和0.1%腐殖酸钠添加组（P<0.05）。42日龄时，抗生素对照组肉仔鸡的血清MDA含量显著高于其他组（P<0.05）；0.3%和0.5%腐殖酸钠添加组的血清T-AOC显著高于抗生素对照组（P<0.05）。综合生产性能、免疫功能和抗氧化能力，建议肉仔鸡饲粮中腐殖酸钠的适宜添加剂量为0.3%~0.5%。

This experiment was conducted to investigate the effects of dietary sodium humate on growth performance, immune function and antioxidant capacity of broilers. Six hundred 1-day-old healthy Arbor Acres (AA) broilers were randomly allocated into 5 groups with 12 replicates (males and females in half) per group and 10 broilers per replicate. Five groups were antibiotic control group (T1), non-antibiotic control group (T2), 0.1% (T3), 0.3% (T4) and 0.5% sodium humate supplemental groups (T5), respectively. The experiment included 2 stages of early stage from 1 to 21 days of age and later stage from 22 to 42 days of age. The results showed as follows:1) average daily gain of male broilers in antibiotic control group and 0.3% sodium humate supplemental group was significantly higher than that in 0.1% and 0.5% sodium humate supplemental groups from 1 to 21 days of age (P<0.05). 2) Dietary sodium humate had no significant effects on dressing percentage, semi-eviscerated percentage, eviscerated percentage, breast muscle percentage, leg muscle percentage and abdominal fat percentage of broilers at 42 days of age (P>0.05). 3) Spleen index of male broilers and thymus index of female broilers in antibiotic control group were significantly higher than those in non-antibiotic control group and 0.1% sodium humate supplemental group at 42 days of age (P<0.05). 4) At 21 days of age, the contents of immunoglobulin A (IgA) and immunoglobulin G (IgG) in serum of broilers in 0.3% and 0.5% sodium humate supplemental groups were significantly higher than those in antibiotic control group and non-antibiotic control group (P<0.05), and the content of immunoglobulin M (IgM) in serum in 0.5% sodium humate supplemental group was significantly higher than that in the other groups (P<0.05). At 42 days of age, the contents of IgA and IgM in serum of broilers in 0.5% sodium humate supplemental group were significantly higher than those in the other groups (P<0.05). 5) At 21 days of age, the content of malonaldehyde (MDA) in serum of broilers in 0.3% and 0.5% sodium humate supplemental groups was significantly lower than that in antibiotic control group, non-antibiotic control group and 0.1% sodium humate supplemental group (P<0.05), and total antioxidant capacity (T-AOC) in serum was significantly higher than that in antibiotic control group, non-antibiotic control group and 0.1% sodium humate supplemental group (P<0.05). At 42 days of age, the content of MDA in serum of broilers in antibiotic control group was significantly higher than that in the other groups (P<0.05), and T-AOC in serum in 0.3% and 0.5% sodium humate supplemental groups was significantly higher than that in antibiotic control group (P<0.05). Combined growth performance, immune function and antioxidant capacity, it is suggested that the appropriate dosage of sodium humate in the diet of broilers is 0.3% to 0.5%.