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The aim of this study was to evaluate the impact of higher selection pressure used in hyperprolificpopulation on the reproduction of subsequent generations breed in a multiplicationherd. Information on 539 litters of 178 ancestors of purebred sows from both hyper-prolificand normal population was included. Higher selection pressure particularly on litter sizeand teat number was applied in the hyper-prolific population. Differences between totalnumber of piglets born, number of piglets born alive or number of piglets weaned wereneither observed on the 1st only nor on the 1st to 5th litters. Likewise, no effect on the ageof sows at the first parturition and number of insemination per pregnant had been found. Asignificant response on selection was determined only for teat number. The descendents ofhyper-prolific population had about 0.37 teats more than sows of normal population. Theresults suggest that to achieve desired litter size in multiplication herds the selection criteriashould be revised and higher focus should be put on the prolificacy, particularly on the littersize than on the traits with high heritability like production traits

Impact of hyper-prolific population generation on the reproduction of sows in multiplication herds