Functional Condition of Cattle with Demodicosis Disease

摘要

Cattle demodicosis takes a special place among parasitic diseases. It causes economic damage due to considerable reduction of meat and milk production, quality of rawhide, reduction of the breeding value of young stock, body resistivity and even the death of animals. The purpose of the study was to analyze the current status of cattle demodicosis and the functional condition of organism at this pathology in Northern Trans-Ural region. Cattle demodicosis is widespread in Tyumen region (prevalence: 43.5±1.03%). The incidence rate of demodicosis in farms and complexes on the production of milk, beef and the rearing stock makes from 1.5 to 44.6%. The smallest indicators of extensiveness and intensity of invasion were observed in bull-calves on feed - 4.9% and in the young stock up to 12 months old - 11.2%, while the highest indicators were observed in heifers of 1.5-2 years old - 56.7% and cows - 19.8%. During the study the animals had the follow ing prevalence levels: low - 73.6%, average - 22.5%, high - 3.1%, generalized - 0.8%. Morphological and biochemical blood tests showed that the demodectic invasion was accompanied by the decrease in quantity and volume of erythrocytes, hemoglobin content and concentration in erythrocytes, which indicates the decrease of oxygen delivery to tissues and organs of animals. The reduction of monocytes and lymphocytes indicates the immunosupressive action of Demodex bovis on the host organism and failure of immune T-system. The parasitizing with Demodex bovis damages liver, kidneys and metabolism of cattle organism in general.