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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

From: Recurrence patterns and lifetime performance of parity 1 sows in breeding herds with different weaning-to-first-mating intervals

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
  1. SE standard error, ICC intraclass correlation coefficient