Table 3.
Antioxidant activity of pigs fed diets with two Cu and Zn sources (SF and HCl) at two Cu levels (15 and 160 mg/kg)1
| SOD, U/mL | GPX, U/L | ||||
|---|---|---|---|---|---|
| Cu and Zn Source | Cu level, mg/kg | Day 14 | Day 42 | Day 14 | Day 42 |
| SF | 173.8 | 138.4 | 3,144 | 3,109 | |
| HCl | 185.1 | 134.7 | 3,437 | 3,284 | |
| SEM | 6.00 | 9.72 | 106.9 | 101.3 | |
| 15 | 179.9 | 143.3 | 3,373 | 3,389 | |
| 160 | 179.0 | 129.8 | 3,208 | 3,004 | |
| SEM | 5.92 | 9.62 | 106.9 | 101.3 | |
| P-value | |||||
| Source | 0.181 | 0.789 | 0.057 | 0.226 | |
| Level | 0.921 | 0.328 | 0.277 | 0.013 | |
| Source × level | 0.465 | 0.792 | 0.621 | 0.637 |
1Data are means of 12 replicate pens for the two-way interaction, whereas for the main effects of source and level are means of 24 replicate pens (one pig per replicate pen was sampled).