| Sample | A550 min−1 | Specific activity (Units∙mg−1) |
| Commercial bovine XOR | 0.074 | 0.460 ± 0.002 |
| Bovine XOR (large scale) | 0.060 | 0.563 ± 0.003 |
| Bovine XOR | 0.035 | 0.435 ± 0.005 |
| Caprine XOR | 0.054 | 0.003 ± 0.001 |
| Ovine XOR | 0.022 | 0.005 ± 0.002 |