sequent parities (–0.144 and –0.145 liveborn piglets/
mm). Therefore, sows with 10 mm additional backfat had
almost 1.5 less liveborn piglets in the first two parities.
Backfat thickness did not influence lifetime productivity
(P-value = 0.6981). Our results confirmed poor relationship
between backfat thickness and lifetime productivity
reported by Rozeboom et al. (1996) and Williams et al.
(2005). Sows with 10 mm thicker backfat farrowed more
litters (0.41 in average) in lifetime and were culled 50
days later, but sow efficiency was not affected by backfat
depth.
Reproductive productivity and sow efficiency was
the highest for owner 2 (Table 2). According to smaller
number of litters in lifetime (–0.88) and age at culling,
owner 1 culled sows earlier. Owner 2 had the lowest cost
per piglet (–1.63 days and –0.8 days). Hybrids had larger
litters, farrowed 0.54 litters more in average and had fewer
days per piglet.