Fig. 8

Spearman correlation between RFI and relative abundance of bacterial features in the ileum of day-35 chickens. All 56 ileal samples were used in Spearman’s rank correlation analysis and only those features with P < 0.05 and |R| ≥ 0.30 were shown (a). Note that there were no features showing a negative correlation with RFI. b Scatterplots of individual ileal bacterial features showing a significant correlation with RFI. P and R values were indicated for each feature. Solid line in the graph represented the line of best fit, while gray shading around the line indicated the 95% confidence interval. In a few cases, 1–3 extremely outlier samples were omitted for the sake of better visualization