合生元的研制及其预防高寒牧区初生羔羊腹泻的研究
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摘要
为避免药物残留及抗生素污染,提高高寒牧区羔羊成活率,运用动物微生
    态学理论及方法,研究分析了高寒牧区自然放牧绵羊肠道正常菌群,通过对其
    优势种群进行安全试验、体外拮抗试验及对低聚糖的利用试验等,筛选出双歧
    杆菌QB_(9701)、乳酸杆菌QL_(9705)及芽孢杆菌QA_(9707)三个菌株,制成益生菌剂,
    并将益生菌剂与低聚糖配合制备合生元制剂,用于预防初生羔羊腹泻。结果表
    明:高寒牧区自然放牧绵羊肠道正常菌群的优势种群为拟杆菌(8.17±0.39)、
    双歧杆菌(7.84±0.42)、乳酸杆菌(7.48±0.37)、大肠杆菌(7.20±0.34),葡萄球
    菌、芽孢杆菌数量较低。所筛选的菌株对致病性大肠杆菌有明显的抑制作用
    (P<0.01),并能很好的利用复合型低聚糖。应用本合生元制剂预防高寒牧区初
    生羔羊腹泻,试验组平均腹泻率为3.85%,较低聚溏、益生菌剂及抗生素对照
    组分别降低8.05%、5.15%及9.65%,成活率为95.4%,较上述各对照组分别
    提高8.2%、7.4%及10.8%。
In this study, the normal microflora in intestines of natural grazed sheep in alpine
     animal husbandry area was analysed by conventional microecological methods. A
     prebiotics was made of Bjfidobacteria QB9701, Lactobacillus QL9705 and Bacillus
     QA9707 which were screened from beneficial bacteria with the safty test, antagonistic
     assay in vitro and oligosaccharides utilizing test, et al. And a sybiotics was
     manufactured with probiotics and oligosaccharides to prevent diarrhoea of newborn
     lambs. The results showed that the preponderant microflora were
     Bacteroidaceae(8.17 ?0.39), Bjfidobacteria(7.84 ?0.42) , Lactobacillus (7.48 ?
     0.37) and E. Ccli. (7.20 ?0.34), while staphylococcus and Bacilli were relatively low
     in intestines of sheep in alpine animal husbandry area. Screened beneficial bacteria
     had remarkably antagonistic effect on pathogenic E. Ccli and could significantly
     utilize by compound oligosaccharides. The preventive assay showed that the
     average diarrhoea rate in the group of sybiotics was 3.85 percent, 8.05, 5.15, 9.65
     percent respectively lower than that in the control of oligosaccharides, probiotics
     and antibiotics, the survival rate was 95.4 percent, 8.2, 7.4, 10.8 percent respectively
     higher than that in the control.
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