[The effect of technological and zoo-hygienic factors on the occurrence of helminths in different strains of pigs].

Seven helminth species were found in 14 different pig stocks in the South Bohemian region. These were: Ascaris suum, Oesophagostomum dentatum, Trichocephalus suis, Hyostrongylus rubidus, Strongyloides ransomi, Capillaria sp. and Metastrongylus sp. O. dentatum dominates in adult animals. A. suum, T. suis and S. ransomi are more frequently encountered in piglets and gilts. The primiparous sows can be therefore regarded as the main source of invasion for piglets. The composition of the animals' helminthofauna changes with age. Piglets were found to harbour two species of parasitic worms, gilts six species, sows five, and boars four species. A beneficial influence of modern technology was demonstrated in the multiplier breeding herd (Vranín). From the view-point of the prevention of helminthoses in pigs as well as other diseases of these animals, it is best to practice the systems of closed herd turnover.