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Effects of different concentrations of ammonia exposure on the diversities in the tracheal microbiota. (A) Chao index. (B) ACE index. (C) Shannon index. (D) Simpson index. (E) The PCoA plot. The different letters above the bars indicate that the indices of alpha diversity index are significantly different among the 4 groups. Control group: T21_0; 15 ppm group: T21_15; 25 ppm group: T21_25; 35 ppm group: T21_35 (data are mean ± SE).
