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(A) Morphology of the cecum was observed by HE staining in different stages. (B–D) Length of muscularis, submucosa, and muscularis of the cecum. The P values indicate main effects for age, diet feed level, and their interaction. All data are expressed as the mean ± SEM. a,b,c,d,e,fMeans lacking common superscript letter indicated significant differences (P < 0.05).
