Table 7 Estimates of fixed factors and random effect variance included in the mixed-effects logistic regression model for the probability of parity 1 sows having a weaning-to-first-mating interval (WMI) of 4 days
Fixed and random effects | Probability of parity 1 sows having WMI 4 days | |
|---|---|---|
Estimate (± SE) | P-value | |
Intercept | - 0.992 (0.1137) | < 0.01 |
Age at first-mating | - 0.0017 (0.0003) | < 0.01 |
Age at first-mating squared | 0.0002 (0.00004) | < 0.01 |
Lactation length | 0.041 (0.0022) | < 0.01 |
Lactation length squared | - 0.0023 (0.0003) | < 0.01 |
Piglets weaned | - 0.023 (0.0039) | < 0.01 |
Piglets weaned squared | 0.0014 (0.0004) | < 0.01 |
Piglets weaned x lactation length | 0.0006 (0.0005) | 0.21 |
Age at first-mating x lactation length | 0.0004 (0.00005) | < 0.01 |
Age at first-mating x piglets weaned | −0.0001 (0.00008) | 0.10 |
Intercept variance at herd level | 1.70 (0.22) | – |
ICC (records within the same herd), % | 34.0 | – |