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Investigations were carried out from December 1995 to July 1996 on the deer farm of W. Stefański Institute of Parasitology of the Polish Academy of Sciences in Kosewo Górne (Olsztyn province). On an area of 100 ha, 170 red deer (Cervus elaphus) and 170 fallow deer (Dama dama) grazed in two separate yards. Before the drug administration, 30 randomly collected faecal samples from red and fallow deer...
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