Fig. 2

Composition of the fecal microbiota of the LRFI and HRFI pigs at the phylum and genera level. Principal component analysis (PCA) plot at phylum (a) and genera (b) level. The X-axis and Y-axis represent the principal component axes, and the percentage represents the value of the component’s interpretation of the different sample composition. The points of different colors or shapes represent samples of different groups, and the closer the two sample points, the more similar the two species composition. The phylum (c) and genera (d) represented at significantly different levels in the microbiota of two groups were shown in an extended error bar plot. The X-axis represents different groups, different colored boxes represent different groups, and the Y-axis represents the average relative abundance of a species in different groups. The differences in the compositions were tested using a two-sided Welch’s test, and P < 0.05 was marked with “*”