The effects of H2O2 injection on the content of oxidative stress markers in the serum of squabs. (A–D) were the ROS, MDA, PCO, and 8-OHdG content in serum, separately. The control group was not subjected to any injection. The negative control group was intraperitoneally injected with 1 ml of normal saline per squab. The low-dose group, medium-dose group, and high-dose group were intraperitoneally injected with 2.0, 2.5, and 3.0 mmol/kg BW H2O2 per squab. The data has been shown as Means ± SEM; The bars with the different lowercase letters are significantly different (p < 0.05). The bars with the same or no lowercase letters are no different (p > 0.05). n = 6.