For the study 19 roebucks of the same age (1-3 years), shot in May 1960 and 1990 in Rogów, were used. During this thirty year period, many changes took place in the density of the roe deer population and in the manner of their taking, as well as in the species composition of cervids living together. The list of species of nematodes found in roe deer in this territory was enriched in 1990 with Ostertagia antipini and Spiculopteragia dagestanica, typical parasites of elk. Increase of the red deer population in the forests of Rogów did not influence the nematode fauna of the abomasum of roe deer in this hunting ground. However, the high increase of roe deer density in Rogów in 1990 (area B), as compared with 1960, significantly influenced the prevalence of infection with Trichostrongylus axei, T. capricola and Haemonchus contortus. The differences between mean intensities of infection of particular nematode species from the subfamily Ostertagiinae in 1960 and 1990 were insignificant. A distinct influence on the intensity of infection of many nematode species was exerted by the manner of taking roe deer, considerably different in area A and В (1990). In strongly exploited area A, the intensity of T. axei, T. capricola and H. contortus considerably decreased. This concerned especially the mean intensity of infection with H. contortus, which decreased in area A by forty-two times in comparison with area B.
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