АССОЦИАТИВНАЯ ЖЕЛУДОЧНО-КИШЕЧНАЯ ИНВАЗИЯ ЛОШАДЕЙ В ЛЕНИНГРАДСКОЙ ОБЛАСТИ

Abstract

The study of the spread of horse infections was carried out in horse farms of the Lo-monosov district of the Leningrad region. The animals in the “Kovcheg” breeding stud farm (SF) and the “Efa” equestrian club (EK) were examined visually and by means of coprology from June 2018 to September 2019. Helminthiasis caused by parasitization of Parascarisequorum, Strongyloideswesteri, representatives of the Trichonemagenus, as well as gastric gadflies of the species Gas-trophilus intestinalis, were diagnosed in horses both in the form of mono infections and in an associative form. Among the mono infections of horses at the “Kovcheg” SF, parascariosis (P. equorum) is dominating, which is present in 56.2% of the infected animals, and at the “Efa” EK - 50% is for strongyloidosis (S. westeri) and gastrophilo-sis (G. intestinalis) - 72.7%. It was discovered that mixed infections are formed by associations of nematodes and gastric gadfly in various combinations: P. equorum + Trichonema sp. + S. westeri + G. intestinalis; P. equorum + Trichonema sp. + G.intestinalis. The most common mixed in-fection was defined as the association of strongylides of the digestive organs (Trichonema sp.) and horse gastrophiluses (G. intestinalis), which corresponds to 35.4% in the “Kovcheg” SF and 45.5% in the “Efa” EK from the number of infected horses. The intensity of infection varied throughout the year. The maximum number of parascaris`s eggs per 1 g of feces was found in September (143.2 ± 2.9), the stron-gylides of the digestive organs and Strongy- loides in June were 154.3 ± 5.3 and 116.8 ± 2.37, respectively. Gastrophilus`s eggs laid on the coat of horses by a gadfly female were found only in the first decade of Sep-tember, which may be due to regional char-acteristics of the pathogen life cycle.