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Observed and estimated species richness and Shannon diversity index of faecal samples collected at 7, 28, and 42 days of age from piglets administered gentamicin (AB; n = 53), Bacillus spores (PRO; n = 50), both gentamicin and Bacillus spores (PRO+AB; n = 53), and control piglets receiving neither gentamicin nor Bacillus spores (CTRL; n = 51). Boxplots show the (A) observed and (B) estimated species richness and (C) Shannon diversity index.
