Table 9.
Effects of dietary sulfur on oxidative stress markers of serum in laying hens (n = 8).
| Item 1 | CONT 2 | MSM | SS | SEM 3 | p-Value |
|---|---|---|---|---|---|
| GPX activity, U/L | |||||
| 4 weeks | 517.5 | 568.6 | 517.6 | 60.47 | 0.831 |
| 8 weeks | 520.3 | 538.3 | 566.3 | 46.85 | 0.824 |
| 12 weeks | 517.0 | 571.9 | 583.4 | 44.31 | 0.574 |
| SOD activity, % | |||||
| 4 weeks | 74.07 | 95.23 | 95.19 | 7.22 | 0.091 |
| 8 weeks | 74.88 | 79.57 | 87.86 | 5.45 | 0.282 |
| 12 weeks | 85.23 | 103.30 | 92.91 | 5.11 | 0.066 |
| TAC, mM | |||||
| 4 weeks | 1.30 | 1.54 | 1.52 | 0.13 | 0.423 |
| 8 weeks | 1.16 | 1.29 | 1.21 | 0.07 | 0.416 |
| 12 weeks | 1.57 | 1.59 | 1.60 | 0.08 | 0.961 |
| CAT, U/mL | |||||
| 4 weeks | 3.06 | 2.59 | 3.19 | 0.36 | 0.541 |
| 8 weeks | 2.60 | 2.43 | 2.78 | 0.42 | 0.851 |
| 12 weeks | 2.45 | 2.96 | 2.63 | 0.23 | 0.341 |
| MDA, µM | |||||
| 4 weeks | 23.66 | 17.23 | 17.17 | 3.15 | 0.315 |
| 8 weeks | 24.62 | 25.40 | 19.70 | 1.60 | 0.083 |
| 12 weeks | 30.90 a | 20.65 b | 20.85 b | 2.29 | 0.025 |
| 8-OHdG, ng/mL | |||||
| 4 weeks | 1.63 | 1.54 | 1.69 | 0.24 | 0.925 |
| 8 weeks | 2.92 | 3.01 | 4.71 | 0.44 | 0.218 |
| 12 weeks | 2.55 | 2.26 | 2.59 | 0.79 | 0.972 |
a, b Means value without a common superscript within the same row differ (p < 0.05). 1 GPX, glutathione peroxidase; SOD, superoxide dismutase; TAC, total antioxidant capacity; CAT, catalase; MDA, malondialdehyde; 8-OHdG, 8-hydroxydeoxyguanosine. 2 CONT, basal diet; MSM, basal diet + methyl sulfonyl methane; SS, basal diet + sodium sulfate. 3 SEM, standard error of the mean.