Fig. 3

AB. Two-way comparisons of pre-weaning piglet mortality risk for sows (probabilityof a sow having a piglet death: PWM) during early (0–1 days) lactation (N = 264,333 sows) between PBA groups and either SB (A) or gestation length (B) groups. Means and SEs were estimated in mixed-effects models. a–dDifferent superscripts within SB or GL groups represent significant differences in means (P < 0.05). x–zDifferent superscripts within PBA groups represent significant differences in means (P < 0.05)