The wild boar (Sus scrofa) is an opportunistic omnivore with an exceptional ability to adjust its diet according to environmental conditions. The conducted study focused both on the diet of wild boar and on their impact on other species, particularly roe deer (Capreolus capreolus). Through dietary analysis, we aimed to determine how often roe deer fawns appear on the menu of wild boar, if at all. Stomach samples were collected between May and July 2021 in the Primorska hunting management district (LUO). The samples were weighed, their contents qualitatively examined, washed through sieves, and subjected to a morphological analysis of the coarse fraction, which was then divided into morphological subcategories. Each subcategory was dried twice, weighed, recorded in Microsoft Excel, and analysed and statistically processed in R Project. In late spring and early summer, wild boar mostly feed on plant-based food, which is highly energy-efficient and easily accessible; however, this does not mean that animal-based food is absent from their diet. In our study, it accounted for a small proportion of the overall diet (5.6%), yet it was still a frequent component of the diet of wild boar in the Primorska LUO. Among the tissues, bones, and hairs belonging to ungulates—primarily roe deer—we detected in our stomach content analysis the hoof of a roe deer fawn. This confirms that wild boar, as opportunistic predators, may directly impact roe deer populations, particularly during periods of population increase caused by abundant acorn and beech mast production.
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