酵母培养物与抗生素对肉仔鸡生长性能及免疫机能影响的研究

用 2 1 0只 1日龄艾维茵肉仔鸡 ,随机分成 7组 ,即 :对照组、 0 1 %、 0 3%、 0 5 %、 0 7%、 0 9%酵母培养物组和抗生素组 (5mg/kg ) ,每组设 3个重复 ,每个重复 1 0只鸡 ,试验期 2 8d,研究不同添加水平的酵母培养物和抗生素对肉仔鸡生长性能和免疫机能的影响。试验结果表明 :0 3%的酵母培养物组日增重、日采食量、饲料转化率 ,较对照组略有提高 ,但差异不显著 (P >0 0 5) ,抗生素组与对照组和酵母培养物组相比差异显著 (P <0 0 5) ;各组之间营养物质代谢率差异不显著 (P >0 0 5) ,酵母培养物组有提高的趋势 ;酵母培养物显著降低大肠杆菌的数量 ,提高双歧杆菌的数量 (P <0 0 5) ,抗生素显著降低了大肠杆菌和双歧杆菌的数量 (P <0 0 5) ;酵母培养物显著提高了肉仔鸡血清IgA、IgG水平(P <0 0 5)和IgM水平 (P >0 0 5)。

Effects of yeast culture and antibiotic supplement on performance and immune function of broilers

broilers were randomly assigned to seven groups, with three replications per group. The control group was provided with the basal diet (not including any drug additive), Yeast culture (YC) was added to the basal diet at the level of 0.1%、0.3%、0.5%、0.7%、0.9% respectively, and xanthomycin was added to the basal diet at the level of 5mg/kg to seven experiment diets. The feeding trial started at 1d and ended at 28 d. The experiment was conducted to study the effects of the different supplementary levels of YC and xanthomycin on performance and immune function in broilers. The results indicated that the dietary YC did not significantly improve the daily weight gain (DWG) and feed conversion ratio (FCR) of broilers of 1～28 days old (P>0.05), DWG and FCR of broilers with 5ppm/kg xanthomycin increased significantly (P<0.05); In comparison to the control and xanthomycin, YC had no effect on availability of dietary nutrients. The dietary YC increases bifidobacterium concentration and reduces E.coli concentration in caecum (P<0.05), however, the dietary xanthomycin, reduces bifidobacterium and E.coli concentration in caecum (P<0.05); The dietary 0.5% YC significantly increased serum IgG level (P<0.05). In comparison to the control and xanthomycin, YC had no effect on IgA、IgM (P>0.05).