Table 6 Estimates and significance levels for the effects of individual body weight, age at about 30 kg, group mean of the social breeding value (SBV), group mean of the direct breeding value (DBV), and the estimated variance of the random group effect on different traits based on model (2) using individual pig level recordings
Traits | Body weight | Age | Number of ear lesions | SBV | DBV | Group variance | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Estimate | p-value | Estimate | p-value | Factor | p-value | Estimate | p-value | Estimate | p-value | \({\sigma }_{\gamma }^{2}\) | |
Number of ear lesions, day 1 | − 0.038 | < 0.001 | 0.0224 | < 0.001 | – | – | − 0.094 | 0.014 | 0.004 | 0.021 | 0 |
Severity of ear lesions conditional upon the number of ear lesions, day 1 | − 0.022 | 0.006 | 0.0306 | 0.0004 | 0.518 | < 0.0001 | − 0.221 | 0.05 | − 0.0052 | 0.25 | 1.24 |
Tail biting (present or not), day 1 | 0.0097 | 0.19 | – | – | – | – | 0.103 | 0.26 | − 0.0009 | 0.80 | 0.59 |
Tail biting (present or not), week 7 | − 0.002 | 0.77 | – | – | – | – | 0.011 | 0.91 | 0.0011 | 0.78 | 0.74 |
Behaviour in the weighing crate, day 1 | − 0.029 | < 0.0001 | – | – | – | – | − 0.03 | 0.61 | − 0.003 | 0.26 | 0.36 |
Behaviour in the weighing crate, week 7 | − 0.006 | 0.32 | – | – | – | – | − 0.146 | 0.027 | − 0.007 | 0.008 | 0.34 |