ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (11): 2301-2309.doi: 10.11843/j.issn.0366-6964.2016.11.019

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Impact of Subclinical Doses of Neomycin Sulfate on the Ileal Mucosa-Associated Microbiota Composition of Broiler Chickens

RONG Ting1,LIU Zhi-chang1,WANG Gang1,LI Shu-hong1,ZHANG Jie1,CAI Zhui1,CHEN Zhuang2*   

  1. (1.State Key Laboratory of Livestock and Poultry Breeding,Guangdong Public Laboratory of Animal Breeding and Nutrition,Guangdong Key Laboratory of Animal Breeding and Nutrition,Institute of Animal Science,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China;2.Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China)
  • Received:2016-06-15 Online:2016-11-23 Published:2016-11-23

Abstract:

 The experiment was conducted to study on the effects of subclinical doses of neomycin sulfate on the ileal mucosa-associated microbiota (MAM) composition and dynamic change of broiler chickens at 1 to 42 days old.Chicken ileal segments were collected in group A (basal diet) and B (basal diet with 50 mg•kg-1 Neomycin Sulfate),and MAM DNA were extracted at day 1,7,14,21,28,35 and 42,respectively.The community of the ileal MAM between two groups were analyzed by Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE)at various ages,and the random clone library of 16S rDNA V3 region of the MAM in ileum at 42 days old between Group A and D was established by analysis of 16S rDNA gene sequences.DGGE profiles showed that the structure of the MAM in ileum between the two groups were of remarkable difference during day 1-28,and the similarity of the MAM in ileum was 40%-60%.The alterations of MAM of ileum were remarkably different between the two groups during day 1-35,with 9%-33% change in group A and 17%-45% change in group D.Analysis of the library in ileum indicated that nine operational taxonomic units (OTUs) (form 94 gene sequences or clones) were detected in the group A,as compared with 6 OTUs (form 93 clones) in the group D.Exiguobacterium and Lactobacillus were predominant in the group A and D,counting for 48.94%,38.30% and 45.16%,49.46%, respectively.The amount of other species found in ileum in group A were different from that in group D.In addition,sequence known being related to Colibacillus were not detected in group A and D.These results indicated that the composition and diversity of the MAM in ileum at day 42 does exist difference between group A and D,especially the proportion of Lactobacillus,these difference might be caused by the continuous antibiotic pressure selection.

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