Figure 1.

Beta-diversity of the microbial communities in the ceca of broilers at 21 d of age based on weighted UniFrac distances (Each spot represents one sample, and each sample is a pool of cecal content from 4 birds.). (A) Positive control (purple spots) vs. negative control (red spots); (B) positive control (purple spots) vs. negative control + amylase (blue spots); (C) positive control (purple spots) vs. negative control + amylase + xylanase (orange spots); (D) positive control (purple spots) vs. negative control + amylase + xylanase + protease (green spots).