Review: Gut Microbiota—A Powerful Tool for Improving Pig Welfare by Influencing Behavior Through the Gut–Brain Axis. - Jian, Xiaoying; Zheng, Duo; Pang, Shengping; Mu, Peiqiang; Jiang, Jun; Wang, Xu; Yan, Xiliang; Wu, Yinbao; Wang, Yan (Animals (2076-2615), 2025)