Fig. 4From: Resveratrol and lycium barbarum polysaccharide improve Qinling giant panda (Ailuropoda melanoleuca Qinlingensis) sperm quality during cryopreservationAntioxidants enhanced oxidation resistance of giant panda spermatozoa during the freeze-thawing process. The levels of ROS (A), MDA (B), SOD (C) and GPX (D) in giant panda semen treated with antioxidants or control were determined by ELISA. The values are shown as means ± SEM of three independent repeats. Letters a, b, c and d indicate significant difference levels, P<0.05Back to article page