Correlation between the differential cecal microbial community of genera and the phenotype of broilers by Spearman correlation analysis. Asterisks indicate significant correlations (* P ≤ 0.05, ** P ≤ 0.01.). Blue indicates a positive correlation, while red indicates a negative correlation. The deeper color means the greater correlation. VH, Occludin, Claudin-1, ZO-1, and MUC2 are the jejunal values. Abbreviations: ADG, average daily gain; DAO, diamine oxidase; FCR, feed conversion ratio; IL-1β, interleukin-1β; IL-6, interleukin-6; IgA, immunoglobulin A; IgM, immunoglobulin M; IgG, immunoglobulin G; MUC-2, mucin-2; VH, villus height; TNF-α, tumor necrosis factor-α; ZO-1, zonula occludens-1.