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In this study records of 58 925 litters of Austrian Large White and 17 846 litters of AustrianLandrace pigs were analysed. Regression models were used to determine the effects oflitter, dam and sire inbreeding on total number of born, born alive and weaned piglets inLarge White and Landrace. In both populations, litter and dam inbreeding showed anegative effect on all traits. Sire inbreeding had no effect in Large White, whereas asignificant positive effect was observed in Landrace. On average, inbred sires with aninbreeding coefficient of 10 % had 0.45 more piglets born total and 0.43 more piglets bornalive in comparison to non-inbred sires. In a further analysis the total inbreedingcoefficients of the animals were divided into two parts: »new« and »old« inbreeding.»New« inbreeding was defined as the period of the first five generations. It was shown thatthe observed inbreeding effects were not only caused by recent inbreeding. Reproductiveperformance was also affected by »old« inbreeding. Finally partial inbreeding coefficientsof four important ancestors in each population were calculated to investigate if inbreedingeffects are similar among these ancestors. The results revealed a varation of inbreedingeffects among the four ancestors. Alleles contibuting to inbreeding depression weredescendent from specific ancestors

Effects of inbreeding on number of piglets born total, born alive and weaned in Austrian Large White and Landrace pigs