Fig. 6.

Associations of 15 key phylotypes (at genus level) with phenotypes. The depth of colors ranging from blue to red represents the magnitude of correlation. The OTU were organized according to their Pearson correlation coefficient. Significant correlations are noted by: ∗, 0.01 < P ≤ 0.05; ∗∗, 0.001 < P ≤ 0.01; ∗∗∗, P ≤ 0.001. GE = gross energy; DM = dry mater; N = total nitrogen; EE = ether extract; VH = villus height; CD = crypt depth; VH:CD = the ratio of villus height to crypt depth; GCN = goblet cell number; ATTD = apparent total tract digestibility.