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The present study was conducted on 31 males and females of the European bison, eliminated during the winter seasons 2007–2011 in the Białowieża Primeval Forest, Poland. The caeca of 14 free-ranging bison, aged from 3 months up to 16 years, the most favorable infection site for the large intestine nematodes, were investigated during the winter of 2007/2008. The parasitological autopsies of the large...
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