Fig 6. Clustered heat map based upon the predominant bacterial families, genera, and species identified in the ceca microbiome of 42-day-old broilers treated with different probiotic formulations.

Hierarchical clustering in the rows is based on the composition similarity between treatments, while that in the columns is based on the microbial relative abundances closeness. Statistical differences (P<0.05) between groups were reported for each bacterial population (*). Diet with no treatment (CON), supplementation with synbiotic (SYNBIO), yeast-based probiotic (YEAST), and single-strain formulations composed of Bacillus amyloliquefaciens (SINGLE1), B. subtilis (SINGLE2), and B. licheniformis (SINGLE3).