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Table 4 Effects of dietary tryptophan levels and diquat injection on the activities of antioxidant enzymes and the malondialdehyde concentration in the plasma and liver of the weaned piglets

From: The effect of dietary tryptophan levels on oxidative stress of liver induced by diquat in weaned piglets

Item - diquat + diquat SEM P
  Trp 0.18% Trp 0.30% Trp 0.45% Trp 0.18% Trp 0.30% Trp 0.45%   Trp diquat Trp × diquat
Plasma
 SOD, U/mL 142.51a 138.17a 135.20a 106.65c 118.94bc 115.55bc 6.76 0.81 < 0.05 0.47
 GPx, U/mL 698.32b 811.76a 810.08a 665.55b 768.24ab 748.07ab 38.60 0.62 0.08 0.66
 MDA, nmol/mL 2.43b 2.53b 2.48b 3.53a 3.58a 3.68a 0.21 0.89 < 0.05 0.94
Liver
 SOD, U/mg protein 564.43a 579.77a 595.80a 469.14b 516.04ab 527.69ab 31.64 0.74 < 0.05 0.09
 GPx, U/mg protein 95.63a 95.71a 95.56a 76.04b 90.03a 99.44a 5.20 0.18 < 0.05 0.05
 MDA, nmol/mg protein 1.60a 1.27b 1.56a 1.74a 1.44ab 1.59a 0.14 0.23 0.09 0.06
  1. +diquat, intraperitoneal injection diquat; − diquat, intraperitoneal injection of sterile 0.9% NaCl solution; Trp 0.18%, dietary tryptophan level 0.18%; Trp 0.30%, dietary tryptophan level 0.30%; Trp 0.45%, dietary tryptophan level 0.45%; SOD, superoxide dismutase; GPx, glutathione peroxidase; MDA, malondialdehyde.
  2. a, b, cMean values with unlike superscript letters were significantly different (P < 0.05).
  3. (Mean values with their pooled standard errors, n = 6).