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Effects of AOP on cecal microbiota diversity in laying breeder hens. (A)Veen diagram. (B) Principal component analysis (PCA) scatterplot. (C) Bacterial alpha-diversity indices (Chao1, Observed_species, Shannon, and Simpson). * indicates a significant difference at p < 0.05 (n = 4). Abbreviations: CON, control group, basal diet; AOP1, basal diet supplemented with 1 g/kg AOP; AOP3, basal diet supplemented with 3 g/kg AOP.
