Figure 3.

Effects of Z. Tk and ZnO on the intestinal microbiota diversity in weaned piglets in 21 and 35 days based on alpha diversity parameters of observed species (A), Chao1 index (B), and the Shannon index (C). Symbols “*” and “**” indicate significant differences at p < 0.05 and p < 0.01, respectively. 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.