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The compositional characteristics of cecal microbiota vary with age at the (A) phylum level, and at the (B-G) family level. **P < 0.01 from Mann-Whitney U test with Holm-Bonferroni correction as post hoc analysis followed by Kruskal-Wallis test. 6 wk, 6-week-old; 31 wk, 31-week-old; 74 wk, 74-week-old; 2 yr, 2-year-old.
