showed a trendP < 0.05
The caecal KO metagenome in ZnO was different from 0 and 50 ppm, both according to the Jaccard and the Bray–Curtis indexes, while it was different from 150 ppm according to the Jaccard index ( P < 0.05, Q < 0.05) and showed a trend toward difference according to the Bray–Curtis index ( P < 0.05, Q = 0.052).