The impact of Codonopsis Pilosulae and Astragalus Membranaceus extract on growth performance, immunity function, antioxidant capacity and intestinal development of weaned piglets - Guo, Rongxia; Zhang, Hao; Jiang, Chenghui; Niu, Chun; Chen, Baoxia; Yuan, Ziwen; Wei, Yanming; Hua, Yongli (Frontiers in Veterinary Science, 2024)