《中国畜牧兽医》 ›› 2017, Vol. 44 ›› Issue (4): 1195-1202.doi: 10.16431/j.cnki.1671-7236.2017.04.036

• 基础兽医 • 上一篇    下一篇

一株凝结芽孢杆菌的分离鉴定及益生性研究

汪攀1,2, 易敢峰1,2, 孙自博2, 王蕊2, 陈丽仙2, 夏冬梅1   

  1. 1. 福建大北农水产科技有限公司, 漳州 363500;
    2. 北京大北农科技集团股份有限公司, 饲用微生物工程国家重点实验室, 北京 100080
  • 收稿日期:2016-11-21 出版日期:2017-04-20 发布日期:2017-05-03
  • 通讯作者: 易敢峰 E-mail:2683763570@qq.com
  • 作者简介:汪攀(1982-),男,河北保定人,硕士,工程师,研究方向:饲用微生物制剂研究与开发,E-mail:174288682@qq.com
  • 基金资助:

    北京科委科技创新基地培育与发展工程子专项(Z161100005016086);大北农集团自立研发项目(DBN20150001)

Study on the Isolation,Identification and Probiotic Characteristics of a Bacillus coagulans

WANG Pan1,2, YI Gan-feng1,2, SUN Zi-bo2, WANG Rui2, CHEN Li-xian2, XIA Dong-mei1   

  1. 1. Fujian Dabeinong Aquatic Science and Technology Co., Ltd., Zhangzhou 363500, China;
    2. State Key Laboratory of Direct-Fed Microbiology Engineering, Beijing Dabeinong Technology Group Co., Ltd., Beijing 100080, China
  • Received:2016-11-21 Online:2017-04-20 Published:2017-05-03

摘要:

试验旨在分离鉴定一株来源于池塘底泥的具有益生功能的凝结芽孢杆菌,并研究其益生性能。从自然池塘底泥分离得到一株产酸能力强的杆状细菌,通过生理生化特征分析和16S rDNA序列比对,鉴定分离菌为凝结芽孢杆菌(Bacillus coagulans)。该分离菌株对大肠杆菌K88、大肠杆菌K99、无乳链球菌和嗜水气单胞菌有抑制作用;在pH 2.5的模拟胃液中处理12 h存活率为71.9%;在胆盐浓度为0.3%的模拟肠液中处理12 h,存活率为84.4%。该分离菌株可有效降解亚硝酸盐,48 h降解率达到96.80%。将270只1日龄AA肉鸡分成3个处理组,日粮分别添加0(Ⅰ组)、1.0×106(Ⅱ组)和1.0×107 CFU/g(Ⅲ组)剂量的凝结芽孢杆菌NJ102,试验期42 d。结果显示,Ⅱ、Ⅲ组肉鸡的平均日增重和终末体重显著高于Ⅰ组(P<0.05),料重比显著低于Ⅰ组(P<0.05),各组间平均日采食量差异均不显著(P>0.05)。结果表明,来源于池塘底泥的凝结芽孢杆菌NJ102有一定的抗逆性和益生能力,能改善肉鸡的生长性能,具备作为微生物饲料添加剂开发的潜力。

关键词: 凝结芽孢杆菌; 分离; 鉴定; 底泥; 益生菌; 肉鸡

Abstract:

This experiment was conducted to isolate and identify a strain of Bacillus coagulans from the soil at the bottom of the pond, and study its probiotic properties. A strong acid producing bacillus was isolated from the soil at the bottom of the pond and identified as Bacillus coagulans through the physiological and biochemical characteristics and 16S rDNA sequence analysis. The strain had high tolerance to the simulated gastric juice (pH 2.5, 12 h of incubation, survival rate was 71.9%) and simulated intestinal fluid (bile salt concentration 0.3%, 12 h of incubation, survival rate was 84.4%) and had high antibacterial activity to E.coliK88, E.coliK99, S.agalactiaeand A. hydrophila. It could degrade nitrite effectively and the degradation rate was 96.80% in 48 h. Two hundred and seventy AA broilers aged 1 day were randomly allocated into 3 groups. Diets were added 0 (group Ⅰ), 1.0×106 (group Ⅱ) and 1.0×107 CFU/g (group Ⅲ) Bacillus coagulans NJ102, respectively. The experiment lasted for 42 d. The average daily gain and final body weight of group Ⅱ and Ⅲ were significantly higher than that of group Ⅰ(P<0.05), and the feed weight ratio of the two groups were significantly lower than that of groupⅠ(P<0.05). There was no significant difference in average feed intake among three groups (P>0.05). It was found that the soil-derived Bacillus coagulans NJ102 from the bottom of the pond had a certain degree of resistance and potential probiotic ability, which could improve the growth performance of broilers and had the potential to be a microbial feed additive.

Key words: Bacillus coagulans; isolation; identification; bottom soil; probiotic; broiler

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