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Relationships between backfat thickness and litter performance for individual parities were analyzed on
performance-test data under field conditions of 8,285 Large White sows from 39 farms. Backfat thickness
measured by ultrasound was corrected for a live weight of 90 kg. Young gilts with a higher backfat thickness
achieved higher litter performance and a higher number of litters. Litter size increased from the first until the
fifth parity.