枯草芽孢杆菌替代抗生素对平养和笼养肉鸡的影响研究

Effects of Bacillus Subtilis Feed Additive Replacing Antibiotics on Floor and Cage Rearing Broilers

将240只1日龄罗斯308(ROSS 308)肉仔鸡,按照饲养方式(地面平养和笼养)以及添加枯草芽孢杆菌替代抗生素与否(替代和不替代)分为4个处理组(1组:抗生素地面平养组;2组:抗生素笼养组;3组:枯草芽孢杆菌地面平养组;4组:枯草芽孢杆菌笼养组),进行42d的饲养试验。结果显示:试验全期,肉鸡末体重和饲料/增重比指标,4组显著优于(P<0.05)1组,2组和3组之间无差异(P>0.05)。21日龄和42日龄肉鸡血清生化指标分析显示:4组肉鸡血清白蛋白浓度显著大于1组;且血清尿酸浓度4组小于1组;而2组和3组之间所有血清测定指标均无差异。以上结果证明,无论是地面平养还是笼养方式,枯草芽孢杆菌替代抗生素对改善肉鸡生长性能均有良好效果,其作用机理主要是提高饲料蛋白的营养利用率。

Two hundred and forty newly born broilers （ROSS 308） were assigned to four experimental treatments （Group 1 to 4）. Aureomycin was used in diets of Group 1 and 2, and Bacillus Subtilis feed ad- ditive substituted Aureomycin in diets of Group 3 and 4. The broilers of Group 1 and 3 were reared on the cement floor, and Group 2 and 4 in cages. In the experimental period of 42 days, the final body weight and feed efficiency （ratio of feed intake to body weight gain） of broilers in Group 4 were superior （P〈0.05） to Group 1,and those of Group 2 and 3 broilers were no differences （P〉0.05）. For the serum biochemistry determined in the age of 21-d or 42-d broilers, the serum albumin concentrations of Group 4 were higher than Group 1. The serum uric add and sugar concentrations of Group 4 were lower than Group 1. There were no differences between Group 2 and 3 for all serum biochemistry determined in this experiment. These findings proved that feed additive Bacillus Subtilis could improve broiler growth performance in both floor and cage rearing systems by enhancing the feed protein digestibility and utilization.