Fig. 1

Diversity analysis of gut microbiota among three groups. A Shannon–Wiener curves, showing that the amount of sequencing data is large enough to reflect the vast majority of microbial information in the samples. B Venn diagram, showing the number of common and unique OTUs, and the similarity and overlap of OTUs among groups. C Simpson index of OTUs, Chao indexes of OTUs (D), and Shannon index (E) of OTUs in three groups. *P < 0.05. F Principal co-ordinates analysis (PCoA analysis). PC1 and PC2 represent the two suspected influencing factors of microbial composition migration. Percentage represents the contribution of principal coordinate components to sample composition differences. The greater the proximity between two sample points, the higher the degree of similarity in terms of species composition between the two samples