›› 2018, Vol. 45 ›› Issue (8): 2219-2226.doi: 10.16431/j.cnki.1671-7236.2018.08.022

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Effects of Compound Probiotics and Antibiotics on Growth Performance, Intestinal Flora and Immune Function of Broilers

YU Jiamin1, CHE Zhen1, QI Xiuye1, XIE Quanxi1, ZHENG Junhong1, LIU Xuejiang2, GU Wei1, SHAN Baolong1   

  1. 1. Shandong Key Laboratory of Animal Micro-Ecological Agent, Shandong Baolai-Leelai Bioengineering Co., Ltd., Tai'an 271000, China;
    2. Shandong Province Feed Quality Inspection Institute, Jinan 250000, China
  • Received:2017-11-06 Online:2018-08-20 Published:2018-08-15

Abstract:

This trial was conducted to evaluate the effects of compound probiotics and antibiotics on growth performance,intestinal microflora and immune function of broilers.Six hundred one-day-old female broiler chickens were randomly divided into 5 groups with 6 replicates per group and 20 broilers per replicate.The broilers in groupⅠ were fed basal diet,and the basal diet+1.0‰ T3(compound probiotics),the basal diet+20 g/t colistin sulphate,the basal diet+50 g/t bacitracin zinc,the basal diet+50 g/t bacitracin zinc+10 g/t colistin sulphate were provided to the broilers in group Ⅱ,Ⅲ,Ⅳ and Ⅴ,respectively.The pre-trial period lasted for 3 days,and the experiment lasted for 35 days.The results showed as follows:Compared with group Ⅰ,Ⅲ,Ⅳ and Ⅴ,the average daily gain (ADG) at each trial stage,the number of Lactobacillus in cecal and rectal were significantly increased (P<0.05),while the feed gain ratio (F/G),the number of Escherichia coli in cecal and rectal were significantly decreased in T3 group.Compared with group Ⅰ,Ⅲ,Ⅳ and Ⅴ,the spleen index of the group treated with T3 increased 27.44%,40.27%,29.01% and 29.81% (P<0.05);The bursa of Fabricius index increased significantly by 12.82%,37.50%,33.33% and 38.95%,respectively (P<0.05);The content of serum endotoxin in T3 group was lower than that of group Ⅰ(P>0.05) and group Ⅲ (24.77%, P<0.05).Compared with the groupⅠ and Ⅲ,the content of secreted immunoglobulin A (sIgA) in T3 group was significantly increased by 32.37% and 25.79%(P<0.05).In conclusion,adding 1.0‰ T3 could improve the growth performance and intestinal flora,promote the development of spleen and bursa in broilers.And the role of increasing the content of sIgA in cecal contents,decreasing the content of serum endotoxin of 1.0‰ T3 was better than the use of 20 g/t of clostridium sulfate.

Key words: compound probiotics; antibiotics; broiler; growth performance; intestinal flora; immune function

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