To the fauna of gastrointestinal nematodes of sheep in the European part of Russia

The purpose of the research is to study fauna gastrointestinal nematodes sheep in European part Russian Federation. Materials and methods . studies were carried out 2022–2023. objects for sets tracts aged from one 2.5 years, delivered slaughterhouse Moscow region different regions Federation, including Oryol Astrakhan regions, Republic Dagestan Stavropol Krai. After slaughter, 10 taken by random sampling method each batch sheep. Then, these subjected helminthological necropsy according K. I. Skryabin (1928). species detected identified et al. (1952) V. M. Ivashkin (1989). Results discussion A degree infection has been established Thus, rate was 80%, – 100%, 100% Krai 50%. Sheep infected with Trichostrongylus colubriformis Teladorsagia circumcincta an intensity infection, on average, 251.86±25.2 99.25±9.9 ex./head respectively region; T. (242.65±24.3 ex./head), (76.6±7.7 ex./head.), Haemonchus contortus (6.5±0.7 ex./head) Marshallagia marshalli (19±1.9 (89.7±9 (43.6±4.4 H. (6.8±0.7 (17.8±1.8 Dagestan; (20.2±2 (11±1.1 most frequently found all four studied two also showed highest rates infection. noted low diversity obviously associated mandatory use anthelmintic drugs. treated against parasites (according accompanying veterinary documentation). At same time, detection animals possibly indicates presence resistant strains.