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Table 5 Estimates of factors in the final logistic regression models of the severe repeat-breeder risks

From: Characteristics and risk factors for severe repeat-breeder female pigs and their lifetime performance in commercial breeding herds

  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  
  1. SE standard error, ICC intraclass correlation coefficient, WMI weaning-to-first-mating interval