Анотация: Between February 20 and October 31, 2003, 2034 sows were inseminated with semen collected from 13 Hungarian Landrace boars. Altogether 16,013 piglets were born: 13,801 (86ч2 per cent) alive, 796 (4ч97 per cent) stillborn and 156 (0ч97 per cent) mummified. A total of 1260 (7ч87 per cent) of the pigs developed signs of postweaning multisystemic wasting syndrome (PMWS). In the groups of sows inseminated with semen from each of the 13 boars, the percentages of farrowings producing piglets with signs of PMWS, stillborn piglets or mummified piglets were very high (59ч4 per cent, 57ч6 per cent and 13ч8 per cent, respectively). There were significant differences between the proportions of piglets with signs of PMWS, stillborn piglets and mummified piglets sired by the different boars: 3ч06 to 15ч6 per cent, 1ч76 to 8ч52 per cent and 0 to 3.22 per cent, respectively