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Effects of Z. Tk and ZnO on the intestinal microbial diversity in weaned piglets in 21 and 35 days based on beta diversity analyses of principal coordinate analysis (A) and UPGMA clustering analysis (B) based on weighted UniFrac. Each of the nine samples is selected from each of the three groups of piglets, i.e., the positive control (PC), the negative control (NC), and the test groups, on days 21 and 35, respectively.
