Adaptation to oxidative stress and impact of chronic oxidative stress on immunity in heat-stressed broilers

1.Glutathione peroxidase activity and serum malondialdehyde of heat-stressed broilers were increased in the early period of heat exposure, and then these parameters decreased.2.The lesion scores of bursa of Fabricius in heat-stressed broilers were increased and decreased in accordance with the activity of glutathione peroxidase and serum malondialdehyde.3.High environmental temperature had not affected relative bursa of Fabricius weight and NDV-HI titer of heat-stressed broilers.4.We concluded that heat-stressed broilers could adapt to oxidative stress, and environmental temperature set at 38±2 °C had not affected humoral immunity.