Table 5 Estimates of factors in the final logistic regression models of the severe repeat-breeder risks
Gilts and sows | Sows only | |||
|---|---|---|---|---|
Fixed effects and variance | Estimate (± SE) | P-value | Estimate (± SE) | P-value |
Intercepta | − 8.584 (0.283) | <0.01 | − 8.836 (0.325) | <0.01 |
Parity groups | <0.01 | <0.01 | ||
Parity 0 | 2.170 (0.149) | – | ||
Parity 1 | 1.534 (0.155) | 1.562 (0.155) | ||
Parity 2–5 | 0.827 (0.151) | 0.862 (0.151) | ||
First-served month group | <0.01 | <0.01 | ||
Apr.-Jun. | 0.028 (0.075) | 0.009 (0.101) | ||
Jul.-Sep. | 0.302 (0.071) | 0.338 (0.094) | ||
Oct.-Dec. | − 0.015 (0.076) | − 0.003 (0.102) | ||
Herd productivity groups | <0.01 | <0.01 | ||
Intermediate-performing herds | 1.636 (0.288) | 1.856 (0.339) | ||
Low-performing herds | 2.473 (0.324) | 2.764 (0.377) | ||
WMI groups | 0.03 | |||
WMI 7–12 days | – | 0.280 (0.111) | ||
WMI 13 days or more | – | − 0.063 (0.134) | ||
Herd variance | 1.12 (0.18) | 1.42 (0.24) | ||
ICC (records within the same herd), % | 25.5 | 30.1 | ||