THE DISTRIBUTION OF THE NEMATODE PARASCARIS EQUORUM (GOEZE, 1782) IN THE NORTH-WESTERN AND EASTERN AREAS OF UZBEKISTAN

One of the common helminth infections of horses in Uzbekistan and other countries is parascaridosis. Infection of horses with the nematode Parascaris equorum (Goeze, 1782) in some regions of our country ranges from 27 to 38%. The purpose of this work is to study the distribution of the nematode Parascaris equorum in the northwestern and eastern regions of Uzbekistan, and the seasonal and age dynamics of infection of horses with this nematode. The studies were carried out in the regions of the Republic of Karakalpakstan and the Ferghana Valley during 2018-2023. One hundred forty-three horses of different age groups in Karakalpakstan and 57 horses in the Fergana Valley were examined by the method of complete and partial helminthological dissections per Skrjabin. Fecal samples from 264 horses were studied using helminthocoprological methods. Parascaris infection rate in the horses examined by the method of complete and partial helminthological dissections averaged 33.6% in the study areas. Helminthocoprological methods were used to study the seasonal and age dynamics of the Parascaris equorum infection in the horses. Seasonal Parascaris equorum infection in the horses was 19.7% in spring, 25.4% in summer, 33.7% in autumn, and 35.2% in winter. Age-related invasiveness of the horses with nematodes was registered at 40.4% in the animals under two years old, 31.4% in the animals from two to five years old, and 24.6% in the animals over five years old.