DISTRIBUTION OF CHORIOPTOSIS IN THE CONDITIONS OF THE NON-BLACK EARTH ZONE
The work was carried out in the conditions of OOO "Bryansk Meat Company" in Tula, Kaluga and Oryol regions. In the period from October to December 2020, we examined 235 animals of beef breed, of which 86 cows (2–3 years old), 90 calves (7–8 months old) and 59 stud bulls (1.5–2 years old) were of the Aberdeen Angus breed. According to the results of morphological studies, a mite of the genus Chorioptes bovis was diagnosed. The epizootological situation with respect to Chorioptes bovis was studied for three farms "Belolipka" in the Tula region, "Uteshevo" in the Kaluga region and "Rabotkogo" in the Oryol region. The keeping in the farms of OOO «BMK» is loose; in summer, the animals are driven to natural pastures, and in winter, they are in winter enclosures. To confirm the diagnosis of chorioptosis, a deep scraping with an abdominal scalpel in the area of the tailhead in the center of the lesion was taken before the appearance of the ichor. The approximate area of the skin lesion was 10–20 cm2 . We have established the greatest prevalence 93.8% with an intensity of invasion 33.1(12–49)±1.02 specimens/cm2 , which were detected in the Oryol region, as well as the lowest prevalence 80% with intensity of invasion 24.8(10–42)±0.96 specimens/cm2 in the Kaluga region.