Research into the determination of intestinal parasitic levels in free-living animals can provide knowledge enabling action to be taken to improve their health status. The aim of the study was to determine the relationship between the carcass weight of wild boars and the degree of endoparasite infection. The research was performed on 165 culled wild boars, from which a representative group (n = 50) was separated and divided according to sex (males n = 24, females n = 26) and age (2-3 years). Separate weight groups were defined for males (< 70 kg, n = 6; 70-80 kg, n = 9; > 80 kg, n = 9) and females (< 45 kg, n = 10; 45-60 kg, n = 10; > 60 kg, n = 6). Oesophagostomum spp., Ascaris suum, Trichuris suis, Eimeria spp. and Strongyloides ransomi were observed and defined in the study population. A statistically significant effect of the overall infection on carcass weight was obtained (F = 9.96; P ≤ 0.01). In the case of overall infection, a more than 7 kg lower carcass weight was observed in infected males. A carcass weight over 15 kg lower was noted for overall infection of females (F = 38.47; P ≤ 0.01), for which average EPG was 2946.67 ± 6485.31 with a median of 400 (50-25 300). Correlations were proven between sex and the average number of Eimeria spp. oocysts, and carcass weight for males (r = –0.84, P ≤ 0.05). In the case of females, correlations were noted between carcass weight and infection by nematodes (r = –0.63, P ≤ 0.05). Studies have shown that there is a need to monitor the environment in order to improve the condition of free-living animals.
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