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A total of 984 primiparous and multiparous crossbred sows (Swedish Landrace × Large White) housed on acommercial pig farm were used to study the effect of the decrease in backfat thickness during lactation andthe level of backfat at weaning on weaning-to-oestrus interval and conception rate of sows. Primiparoussows (n=213) received a single injection of 400 IU eCG + 200 IU hCG (PG600®, Intervet) at weaning andapproximately 30 % of sows did not respond to the first treatment. First-farrowing sows produced significantlyfewer live-born piglets, had markedly thinner backfat in late gestation, showed significant loss of backfatthickness during lactation and showed thinner backfat at weaning than sows with a greater number ofparities. Primiparous sows with backfat thinner than 18 mm at weaning lost an average of 21 % of backfatduring lactation and had a significantly longer weaning-to-oestrus interval (31.75 ± 2.22 days), even after asecond treatment with PG600®, than both primiparous sows which responded to the first treatment (5.95 ± 0.16days) and multiparous sows which were not treated (5.19 ± 0.12 days). The primiparous and multiparoussows with thicker backfat at farrowing also had thicker backfat at weaning (r=0.874 and r=0.938 forprimiparous and multiparous sows, respectively). Sows with thicker backfat at weaning showed a shorterweaning-to-oestrus interval and this correlation was higher for primiparous than for multiparous sows(r=−0.192 and r=−0.100, respectively). Thicker backfat of the sows at weaning was moderately but significantlycorrelated with lower loss of backfat during lactation (r=−0.179 and r=−0.273 for primiparous andmultiparous sows, respectively). The present study showed that monitoring of backfat thickness and loss ofbackfat during lactation represents a useful tool to decrease non-productive days and improve the efficiencyof high-producing pig herds

Effect of backfat loss during lactation on weaning-to-oestrus interval of sows at gonadotropin application