Figure 4.

Effects of dietary tryptophan supplementation on jejunal redox status of piglets challenged with diquat. (A) Superoxide dismutase activity; (B) glutathione peroxidase activity; (C) catalase activity; (D) malondialdehyde concentration. Data are means ± standard error; n = 8 for each group. Mean values sharing different superscripts within the same row differ significantly (p < 0.05). Control, piglets fed the basal diet without diquat injection; diquat, piglets fed the basal diet and challenged with diquat; 0.15% Trp + diquat, piglets fed the 0.15% supplemented diet and treated with diquat.