Fig. 1

A landscape of pig gut microbiome in China. a PCA of gut microbial KEGG orthologous groups (KOs) in pigs revealed by metagenomics. b Diversity analysis of KOs based on Shannon index revealed by metagenomics. c Rarefaction curves of the observed species index revealed by 16S rDNA gene amplicon sequencing. d Species accumulation curve analysis of OTUs revealed by 16S rDNA gene amplicon sequencing. e PCoA of gut bacterial community based on the Bray–Curtis distance. f Analysis of gut bacterial alpha diversity based on the Shannon index. g Cladogram of gut bacterial compositions in weaned piglets using LEfSe. h Cladogram of gut bacterial compositions in finishing pigs using LEfSe. The data are presented as the mean ± SEM (n = 8) and were evaluated by Kruskal–Wallis test. **p < 0.01, *p < 0.05