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The relations between sows production of piglets and their own on-farm testing results as well as their sibs results are analysed. The study is based on actual data from 248 normal pig farms, 3746 sows and 5195 litters. A rapid growth rate seems to be correlated to early maturity by young sows. A favourable genetic relationship between farrowing age and litter size of the gilt was found. Farrowing interval and litter size showed a positive phenotypic correlation. Sows lean in carcase had a higher farrowing age than other sows. Other carcase characteristics were not correlated to fertility traits. Breeding for fertility is possible by pigs without losses in other traits.

Production of piglets as related to slaughter and growth traits