本试验旨在研究复合微生态制剂与饲用抗生素对肉鸡生长性能、免疫性能和抗氧化指标的影响。试验选用500只1日龄雌性健康黄羽肉鸡,随机分为5组,每组4个重复,每个重复25只。试验预试期3 d,正试期35 d。Ⅰ组为对照组,饲喂不含抗生素的基础饲粮,Ⅴ组为抗生素组,Ⅱ、Ⅲ、Ⅳ组为复合微生态制剂组,复合微生态制剂添加量分别为1.0‰、2.0‰、4.0‰。试验结束后,测定各组试鸡生长性能、免疫性能和抗氧化指标。结果表明:1)在每个试验阶段,Ⅲ组肉鸡平均日增重均显著高于对照组和抗生素组(P<0.05);且除4~10日龄和32~38日龄料重比外,Ⅲ组肉鸡料重比最低,显著低于对照组和抗生素组(P<0.05)。2)24日龄时,Ⅲ组的脾脏指数、法氏囊指数分别高出Ⅴ组40.6%、47.7%,差异显著(P<0.05);17日龄和24日龄时,Ⅲ组血清免疫球蛋白G含量分别高出Ⅴ组24.3%、16.2%,差异显著(P<0.05);24日龄和31日龄时,Ⅲ组盲肠内容物的分泌型免疫球蛋白A含量分别高出Ⅴ组11.4%、39.3%,差异显著(P<0.05);10日龄和38日龄时,Ⅲ组新城疫抗体效价分别高出Ⅴ组37.0%、32.4%,差异显著(P<0.05)。3)10日龄和38日龄时,Ⅲ组血清总抗氧化能力最高,分别高出Ⅴ组45.2%、56.7%,差异显著(P<0.05)。由此可知,添加2.0‰复合微生态制剂能够提高肉鸡生长性能,提高其抗氧化能力。同时复合微生态制剂的添加可以在一定程度上增强肉鸡的免疫功能。

This experiment was conducted to investigate the effects of compound probiotics and antibiotics on the growth performance, immune function and antioxidant indices of broilers. Five hundred one-day-old female broiler chickens were randomly divided into 5 groups with 4 replicates in each group and 25 chickens per replicate. The chickens in the control group(group Ⅰ)were only fed a basal diet, group Ⅴ was the antibiotics group, and groups Ⅱ, Ⅲ and Ⅳ were compound probiotics groups, supplemented with 1.0‰, 2.0‰ and 4.0‰ compound probiotics, respectively. The pre-trial period lasted for 3 days, and the experiment lasted for 35 days. Growth performance, immune function and antioxidant indices were determined in different periods. The results showed as follows: 1) in every test period, compared with the control group and antibiotics group, the average daily gain of broilers in group Ⅲ was significantly higher (P<0.05); except feed/gain (F/G) at age of 4 to 10 days and 32 to 38 days, the F/G in group Ⅲ was significantly lower (P<0.05); 2) at the age of 24 days, the spleen index and the bursa of Fabricius index in group Ⅲ were all higher than those in group Ⅴ (P<0.05), higher above 40.6% and 47.7%, respectively; at the age of 17 days and 24 days, the serum immunoglobulin G (IgG) concentrations in group Ⅲ were all higher than those in group Ⅴ (P<0.05), higher above 24.3% and 16.2%, respectively; the secretory immunoglobulin A (sIgA) of intestinal fluid in group Ⅲ were all higher than those in group Ⅴ, higher above 11.4% and 39.3%, respectively (P<0.05) at the age of 24 days and 31 days; at the age of 10 days and 38 days, the antibody titer in group Ⅲ were all higher than those in group Ⅴ, higher above 37.0% and 32.4%, respectively(P<0.05);3) at the age of 10 days and 38 days, the serum total antioxidant capacity in group Ⅲ were all higher than those in group Ⅴ, higher above 45.2% and 56.7%, respectively. In conclusion, the supplementation of 2.0‰ compound probiotics can improve growth performance, and enhance the antioxidant function of broilers. Meanwhile, the supplementation of compound probiotics can improve the immune function of broilers to some degree.