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The aim of this study was to investigate the boars, sows and gilts for the presence of infectious pathogens that cause deterioration of health and reproduction of pigs. This research was conducted in accordance with the Ordinance on establishing a program of measures for animal health protection and it included breeding boars, sows and gilts, which had an abortion. Tested boars and breeding sows which had an abortion were seronegative to Brucella spp. and Listeria spp., while on two farms seropositive results for Leptospira spp. were found. Seroprevalence of Aujeszky���s disease and PRRS in boars was 29.21% and 41.57%. All boars were seronegative for tuberculosis, and no pathogens of Brucella spp., Leptospira spp., and Listeria spp. were found in aborted fetuses and parts of placenta of sows and gilts. The results of this study point out the importance of veterinary legislation in health care and reproduction of pigs, which is reflected in the regular monitoring of breeding animals, prevention of disease occurrence and spreading and control of infectious diseases in pigs.