Dietary carbon loaded with nano-ZnO alters the gut microbiota community to mediate bile acid metabolism and potentiate intestinal immune function in fattening beef cattle oleh Haibo Zhang, Weikun Guan, Lizhi Li, Dongsheng Guo, Xiangfei Zhang, Jiuqiang Guan, Runxiao Luo, Siying Zheng, Jiangwen Fu, Yingying Cheng, Qin He