低聚木糖与抗生素配伍应用对肉鸡生产性能的影响

Effects of Different Levels of Xylooligosaccharides and Antibiotics on the Production Performance of Broilers

选取1日龄1008羽健康AA肉鸡，随机分成6个组，各组分别饲喂基础日粮（对照组）和在基础日粮中添加抗生素（杆菌肽锌16．7mg／kg、硫酸粘杆菌3．3mg／kg）、“抗生素＋低聚木糖”6种不同日粮，研究不同处理对肉鸡生产性能的影响。结果表明：与对照组相比，各试验组前期、后期和全期的体增重分别提高了-2．5％-1．9％、1．5％-16．2％和1．0％．10．3％，“抗生素20mg／kg＋0．015％低聚木糖”组肉鸡后期和全期的体增重提高明显（P〈0．05），“抗生素20mg／kg＋0．015％低聚木糖”组和“抗生素15mg／kg＋0．015％低聚木糖”组对肉鸡全期的体增重改善程度分别是“抗生素20mg／kg＋0．01％低聚木糖”组和“抗生素15mg／kg＋0．01％低聚木糖”组的2．6倍和3倍（P〉0．05）；添加“抗生素20mg／kg＋0．015％低聚木糖”组肉鸡前期（P〉0．05）、后期（P〈0．05）和全期（P〈0．05）的采食量提高；“抗生素20mg／kg＋0．015％低聚木糖”组体增重和料重比最佳。

1008 one-day AA broilers were randomly divided into to 6 groups. Each group was fed with a basal diet （for control group） and 6 different diets supplemented with antibiotics （zinc bacitracin 16.7 mg/kg and colistin sulfate 3.3 mg/kg）, antibiotics （20 mg/kg） ＋ xylooligosac - charides （ 100 mg/kg or 150 mg/kg） and antibiotics （ 15 mg/kg） ＋ XOS （ 100 mg/kg or 150 mg/kg） based on the basal diet to study the effects of XOS and antibiotics on the production performance. The results showed that compared with control group, the body weight gain （BWG） of each experimental group increased by -2.5% - 1.9% in the starter stage （0 - 21 days）, 1.5% - 16.2% in the finishing stage （22 -42 days） and 1.0% - 10.3% in the whole stage （0 -42 days） respectively. The basal diet supplemented with antibiotics ＋ 0.015% XOS apparently improved BWG in both finishing stage and whole stage （P 〈 0.05）. The improvement of supplementing ＂antibiotics ＋ 0.015% XOS＂ and ＂75% antibiotics ＋ 0. 015% XOS＂ was nearly 2.6 and 3 folds （ P 〉 0.05 ） respectively, when comparing with ＂antibiotics ＋ 0.01% XOS＂ and ＂75% antibiotics ＋ 0.01% XOS＂. Supplementing antibiotics ＋ 0.015% XOS enhanced feed intake in the starter and finishing stage. The diet supplemented with antibiotics ＋ 0.015% XOS was the best for amelioration in BWG and FCR compared with other groups.