Abstract
<jats:p>As part of an experiment with artificial laying of eggs and larvae, the effectiveness of various helminth ova- and larva-scanning methods for the diagnosis of gastrointestinal strongylatosis in cattle was studied. The Nikiforov method revealed the presence of a large number of strongylate eggs in the studied samples, equal to 64.0±8.3. Additionally, 25.1±4.5 larvae were detected out of the 100 laid larvae. In the studied material, the Darling method revealed 36.1±5.6% of eggs and 19.4±3.2% of larvae. In the samples studied by Fulleborn, Kotelnikov-Khrenov and sedimentation methods, the percentage of eggs detected was 39.3±5.2, 52.0±4.8 and 18.2±3.4. As a result of monitoring the epizootic situation for bovine strongylatoses in 2024-2025, it was found that the extensinvasation in the Vakhitov agricultural Complex of the Kukmorsky district of the Republic of Tatarstan varies from 5% to 45 %. Animals are infected with Strongylata helminths, which are located in the digestive tract of ruminants, starting at the age of 30 days. Infection can occur up to 24 months. The maximum number of infected animals is observed at the age of 12 months. The season of the year also has a significant impact on the infection rate of animals. In summer and autumn, the maximum extent and intensity of strongylatosis infection are observed. In other seasons, these rates are significantly lower.</jats:p>