摘要
试验旨在研究大麦—小麦无抗型日粮中添加壳聚糖(CTS)和非淀粉多糖(NSP)酶对1~42 d肉鸡生长性能、空肠组织结构和盲肠微生物组成的影响。选择720羽1 d ROSS 308商品代肉仔鸡,随机分为4组,每组6个重复(30羽/重复),对照组饲喂以大麦—小麦为主的基础日粮,CTS组、NSP酶组和CTS+NSP酶组饲喂含300 mg/kg CTS、200 mg/kg NSP酶和150 mg/kg CTS+100 mg/kg NSP酶的日粮,试验期42 d。结果显示:CTS组、NSP酶组和CTS+NSP酶组较对照组显著提高了21 d、42 d肉鸡末重和1~21 d、1~42 d肉鸡平均日增重(P<0.05)。CTS+NSP酶组较对照组、CTS组和NSP酶组显著降低22~42 d及1~42 d料重比。CTS组和CTS+NSP酶组1~42 d肉鸡胸腺指数显著高于对照组和NSP酶组(P<0.05)。日粮添加CTS+NSP酶较其他各组显著降低了空肠隐窝深度(P<0.05),显著提高了空肠绒毛高度与隐窝深度比值(P<0.05)。NSP酶组或CTS+NSP酶较对照组和CTS组显著提高了盲肠乳酸杆菌含量(P<0.05),与对照组相比,CTS组、NSP酶组或CTS+NSP酶组均显著降低了盲肠大肠杆菌数量(P<0.05)。综合考虑,本试验中150 mg/kg CTS+100 mg/kg NSP酶应用效果最佳。
The present study was conducted to investigate the effects of chitosan（CTS）and non-starch polysaccharide（NSP）enzymes on growth performance and caeca microbiota composition of broilers in response to barley-wheat based diets with no antibiotics.Seven hundred and twenty 1 d Ross 308 commercial broilers were randomly allotted to four groups each with 6 replicates of 30 broilers.The control group fed with a basal barley-wheat diet and the trial groups fed with basal diets supplementation of 300 mg/kg CTS,200 mg/kg NSP enzymes and 150 mg/kg CTS＋100 mg/kg NSP enzymes under the same circumstances for 6 weeks.The results showed that supplementation of CTS,NSP enzymes and CTS＋NSP enzymes signifi cantly increased weight of broilers at 21 dand 42 d as well as the average daily gain（P〈0.05）.The CTS＋NSP enzymes group had the lowest feed gain ratio at 22 - 42 d and 1 - 42 d（P〈0.05）.The thymus index in CTS and CTS＋NSP enzymes groups was higher than that in control and NSP enzymes groups（P〈0.05）.Compared with control,CTS and NSP enzymes groups,CTS＋NSP enzymes group had the highest villous height to crypt depth ratio（P〈0.05）and the lowest crypt depth（P〈0.05）.The NSP enzymes and CTS＋NSP enzymes groups signifi cantly increased the quantity of Lactobacillus in caeca（P〈0.05）,while CTS,NSP enzymes and CTS＋NSP enzymes groups had the lowest quantity of Escherichia coli in caeca among the groups（P〈0.05）.Based on the performance,immunity and caeca microbiota composition,we consider that the appropriate additives in barley-wheat based diets for broilers of 1 - 42 d was combination of 150 mg/kg CTS and 100 mg/kg NSP enzymes.
出处
《中国饲料》
北大核心
2018年第2期19-24,共6页
China Feed
关键词
壳聚糖
非淀粉多糖酶
肉鸡
生长性能
盲肠微生物组成
chitosan
non-starch polysaccharide
broiler
growth performance
caeca microbiota composition
