Investigating the regulatory effect of Shen Qi Bu Qi powder on the gastrointestinal flora and serum metabolites in calves - Yang, Haochi; Ren, Jianming; Ji, Peng; Zhang, Xiaosong; Mai, Zhanhai; Li, Chenchen; Zhao, Nianshou; Ma, Ting; Zhu, Xiaopeng; Hua, Yongli; Wei, Yanming (Frontiers in Cellular and Infection Microbiology, 2024)