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Indicators of microbial richness and diversity for piglets in the No Antibiotic and Antibiotic groups: (A) Number of OTUs (richness indicator); (B) Faith's Phylogenetic Diversity Index (diversity indicator). P-values indicate the contrast between piglets in the two groups on each (day 35: end of phase 1; day 49: end of phase 2; day 63: end of phase 3).
