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. 2021 Oct 1;8:706987. doi: 10.3389/fvets.2021.706987

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Copyright © 2021 Yan, Xiao, Li, Liu, Zhao, Liu, Chen and Zhao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The Venn diagram; different color represents different group. The interior of each circle symbolically represents the number of operational taxonomic units (OTUs) in a certain group; the overlapping area represents the set of common OTUs in the counterpart groups; the single-layer zone represents the unique OTUs in a certain group. (B) Shannon diversity. (C) Principal coordinate analysis (PCoA); the abscissa represents the first principal coordinate, the percentage in brackets represents the contribution rate of the first principal coordinate to the sample difference, the ordinate represents the second principal coordinate, and the percentage in brackets represents the contribution rate of the second principal coordinate to the sample difference. CK, check, n = 10; BR, broiler recipient, n = 10; BD, broiler donor, a pooled sample of N = 1.