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Serum antioxidant capacities of dairy cows in non-HS and HS season. All the 40 dairy cows were fed with standard diet. Blood samples were collected during spring (non-HS season) and summer (HS season), respectively. Superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) (A), catalase (CAT) (B), total antioxidation (T-AOC) (C), and malondialdehyde (MDA) (D) levels in the serum of dairy cows in non-HS and HS seasons. **: p < 0.01
