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Table 5 Antioxidant enzyme activity and malondialdehyde concentration in 17 d old broiler chicks fed different copper levels and sources

From: Broiler responses to copper levels and sources: growth, tissue mineral content, antioxidant status and mRNA expression of genes involved in lipid and protein metabolism

Item Copper levels, mg/kg Mean SEM1 Source Level Source × Level L2 Q3
0 4 8 12 16 Inorganic Organic       
Breast muscle
  Superoxide dismutase, g/g pro 1.62 1.61 1.66 1.66 1.62b 1.66a 1.61b 0.013 0.050 0.471 0.173 0.499 0.266
  Glutathione Peroxidase, IU/g pro 398 391 358 403 404 491a 291b 14.6  < 0.01 0.303 0.001 0.653 0.143
  Inorganic 436 507 454 515 541    11.9      < 0.01 0.795
  Organic 361 274 263 291 268    12.2     0.028 0.068
  p-value4  < 0.01  < 0.01  < 0.01  < 0.01  < 0.01         
  MDA, mg/kg 0.0100 0.0161 0.0161 0.0161 0.0162 0.0181 0.0117 0.002 0.083 0.738 0.385   
Liver
  Superoxide dismutase, g/g pro 363 327 292 313 320 341a 306b 8.67 0.033 0.101 0.164 0.081 0.042
  Glutathione Peroxidase, IU/g pro 2624 2608 2592 2475 2510 2951a 2173b 51.1  < 0.01 0.170 0.193 0.030 0.991
  1. 1Standard error of means
  2. 2Linear effect of dietary copper levels
  3. 3Quadratic effect of dietary copper levels
  4. 4Effect of the source (organic and inorganic) on Glutathione Peroxidase activity by dietary copper levels
  5. Organic: copper proteinate (CuPro) and organic trace minerals; Inorganic: copper sulphate (CuSO4.5H2O) and inorganic trace minerals; MDA: malondialdehyde
  6. abMeans with a different superscript in a row are different (P < 0.05)