CAT and intestinal disorder: Given that weaning stress triggers oxidative stress, which is characterized by an imbalance between the production of free radicals and the scavenging ability of the antioxidant defense system, has been involved in the intestinal disorders [1, 4, 5], we further determined the oxidative indices and found that dietary quercetin increased antioxidant capacity of the jejunum indicated by increased T-AOC, CAT, and GSH/GSSG but decreased oxidative metabolite MDA.