PPARA and Disorder of lipid metabolism: Supplementation of Lactobacillus rhamnosus GG powder improved intestinal morphology, enhanced intestinal antioxidant capacity, and alleviated jejunal mucosal inflammation and lipid metabolism disorders in PEDV-infected piglets, which may be regulated by Lactobacillus rhamnosus GG powder by altering the expression of TNF signaling pathway, PPAR signaling pathway and fat digestion and absorption pathway.