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Four free living European bison from Białowieża/Caucasus line shot in february 1997 within Lutowiska Forestry District in the Bieszczady Mountains were used in investigations. All examined ani mais were infected with helminths. There were found 10 species of parasites. Five species of them Ostertagia leptospicularis, O. kolchida, Spiculopteragia boehmi, Cooperia pectinata and Ashworthius sidemi are...
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