In 1998, 21 Przewalski’s horses Equus przewalskii have been introduced in the Chernobyl exclusion zone. During the years 1999–2000, studies on food preference were carried out in a special enclosure (70 ha) constructed for theses horses. A total of 52 plant species, belonging to 25 families were grazed by the horses. This comprised 43 % of all plant species recorded in this area. The most common families were Poaceae (17 species), Fabaceae (7 species) and Asteraceae (7 species). In general, Elytrigia repens, Trifolium pratense, Vicia cracca, Poa trivialis, Dactylis glomerata and Bromus inermis were the most preferred plant species. This preference has, however, varied from month to month. The most preferred plant species in May were Elytrigia repens, Corynephorus canescens, Festuca valesiaca and Chenopodium albuy; in June – Fabaceae , in July – Dactylis glomerata and Trifolium and in August – Elytrygia repens and Vicia cracca. A total of 27 anti-helminthic plant species were recorded in the study area, 18 of them were grazed by Przewalski’s horse.
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