Maternal and Progeny Measures
Pregnant dams were weighed and backfat depth was measured by ultrasound at the P2 site (65 mm from the midline over the final rib, using a linear-array 3.5-mHz live ultrasound instrument; Noveko, Montréal, Canada) before the beginning of treatments at d 20 to 24 of pregnancy, at d 50 of pregnancy, on transfer to the farrowing shed at d 104 to 111 of pregnancy, and at weaning. A subset (approximately 60% of dams to minimize disturbance of the dams on the day of birth) were weighed and P2 backfat was recorded on the day of farrowing for each replicate week of the study. Numbers of live piglets, stillbirths, and mummified piglets were recorded within 24 h of birth. Total litter weight and number were recorded on the day of delivery, after fostering, at d 14 of lactation, and at weaning. Preweaning piglet losses, reasons for removal, and dates at removal were recorded throughout lactation. Numbers of live piglets, stillbirths, and mummified piglets were recorded within 24 h of birth for the subsequent pregnancy.
Statistical Analyses
Maternal and Progeny MeasuresPregnant dams were weighed and backfat depth was measured by ultrasound at the P2 site (65 mm from the midline over the final rib, using a linear-array 3.5-mHz live ultrasound instrument; Noveko, Montréal, Canada) before the beginning of treatments at d 20 to 24 of pregnancy, at d 50 of pregnancy, on transfer to the farrowing shed at d 104 to 111 of pregnancy, and at weaning. A subset (approximately 60% of dams to minimize disturbance of the dams on the day of birth) were weighed and P2 backfat was recorded on the day of farrowing for each replicate week of the study. Numbers of live piglets, stillbirths, and mummified piglets were recorded within 24 h of birth. Total litter weight and number were recorded on the day of delivery, after fostering, at d 14 of lactation, and at weaning. Preweaning piglet losses, reasons for removal, and dates at removal were recorded throughout lactation. Numbers of live piglets, stillbirths, and mummified piglets were recorded within 24 h of birth for the subsequent pregnancy.Statistical Analyses
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