On the horse nematodes ecological features in the Altai region

Currently, the problem of horse helminthiasis is gaining special relevance, which is associated with an increase in the livestock population. The purpose of this work is to study the distribution of some nematodes, namely parascaris and strongylates in horses in the Altai Region. In each age and sex group, a helminthic ovoscopic examination was carried out monthly, in addition, after the larvae were cultured, helmintholarvoscopy was performed in order to determine the genera of gastrointestinal strongylates. After slaughter or death, a complete helminthological autopsy was carried out with the establishment of the species of helminths. Our coproovoscopic studies revealed parascaris eggs in all farms of various forms of ownership. The incidence rate in foals up to 1 year old ranges from 47.4 to 56.5 %, in young animals up to 2 years old from 31.8 to 42.4 %, from 2 to 4 years old from 22.5 to 35.4 %. On average, the extensiveness of the invasion was 34.3%. The intensity and extensiveness of parascariotic and strongylatous invasions of horses in individual farms are in direct proportion to the general condition of the animals. The more complete feeding with moderate exploitation of horses, the lower the degree of their infestation with parascariasis and strongylatosis. The upper limiting temperature for the development of parascaris can be considered 39 °С, the lower 12 °С. Parascaris eggs, which have lain for more than a year in the ground under the snow, retain their viability in Siberia for more than one year.