Table 7. The effects of pre-weaning environmental enrichment-based materials on cortisol in pigs
| Control1) | WBW-1 | WBW-2 | SEM | p-value |
| X2) | O | X | O | X | O | BWN | AWN | Interaction |
| Cortisol (pg/mg) |
| Hair | 78.56 | 73.12 | 76.83 | 71.16 | 78.48 | 70.58 | 3.98 | 0.799 | 0.010 | 0.891 |
| Saliva | 5.02 | 4.65 | 4.80 | 4.65 | 4.90 | 4.46 | 0.47 | 0.896 | 0.245 | 0.906 |
Control, no environmental enrichment installation during lactation; WBW-1, environmental enrichment installation 1 week before weaning; WBW-2, environmental enrichment installation 2 weeks before weaning.
X, without object installation as environmental enrichment after weaning; O, with object installation as environmental enrichment after weaning.