Relative read abundance of different bacterial phylum A. and families B. within different communities in the ileal, cecal and colonic digesta in different treatments was detected. Values were means, n = 3. Phyla and families with proportion less than 1% were not listed. Control, corn-soybean meal basal diet; Nano-ZnO, corn-soybean meal basal diet supplemented with 600 mg Zn/kg as nano zinc oxide; ZnO, corn-soybean meal basal diet supplemented with 2000 mg Zn/kg from zinc oxide. Ce-/Co-/Il-control, the cecal/colonic/ileal digesta in the control treatment; Ce-//Co-/Il-Nano-ZnO, the cecal/colonic/ileal digesta in the Nano-ZnO treatment; Ce-/Co-/Il-ZnO, the cecal/colonic/ileal digesta in the ZnO treatment.