TABLE 6.
Exploratory behavior of all objects during the test trial of the NOR task1.
| Measurements | RI | Total object visit time, s | Number of all object visits, n | Mean object visit time, s/visit | Latency to first object visit, s | Latency to last object visit, s |
| Effect of rearing | ||||||
| AR | 0.55 | 55.1 | 11.7 | 4.4 | 12.8 | 245.3 |
| SR | 0.55 | 75.8 | 13.9 | 5.0 | 7.7 | 273.0 |
| SEM | 0.050 | 10.45 | 1.14 | 0.73 | 4.00 | 13.98 |
| Effect of age | ||||||
| Week 4 | 0.47 | 58.9 | 12.1 | 4.2 | 11.3 | 254.2 |
| Week 8 | 0.63 | 71.9 | 13.4 | 5.1 | 9.3 | 264.1 |
| SEM | 0.045 | 9.49 | 1.03 | 0.68 | 3.70 | 12.95 |
| Interaction means | ||||||
| AR:Week 4 | 0.52ab | 58.3 | 11.7 | 4.4 | 13.9 | 235.0 |
| AR:Week 8 | 0.57ab | 51.9 | 11.6 | 4.3 | 11.7 | 255.6 |
| SR:Week 4 | 0.42a | 59.6 | 12.5 | 4.0 | 8.6 | 273.4 |
| SR:Week 8 | 0.68b | 92.0 | 15.3 | 5.9 | 6.8 | 272.7 |
| SEM | 0.074 | 15.74 | 1.73 | 1.07 | 5.76 | 20.06 |
| P-value2 | ||||||
| Rearing | 0.949 | 0.102 | 0.105 | 0.475 | 0.261 | 0.081 |
| Age | 0.010 | 0.299 | 0.348 | 0.277 | 0.649 | 0.518 |
| Rearing:Age | 0.095 | 0.122 | 0.297 | 0.208 | 0.968 | 0.484 |
abSuperscript letters denote differences between treatment means (P < 0.05).
1Pigs were reared in an artificial rearing system or with sows for the first 4 weeks of age. After the first 4 weeks of age, both groups were housed together in nursery pens. AR, artificially reared pigs; RI, recognition index; SEM, standard error of mean; SR, sow-reared pigs.
2P-values derived from repeated-measures ANOVA for the main effects and the interaction. Significant P-values are shown in bold text for emphasis.