Regularities of the appearance and distribution of dermatitis of parasitic etiology of cattle

Ectoparasites (mites, mallophages, bloodsuckers, lice) contribute to the patterns of occurrence and spread of dermatitis of parasitic origin in the cold season. The presence of flares on the surface of the skin, first of all, contribute to the destruction of the nerve endings of the skin, which leads to itching (scratching) due to the toxic effects of the vital activity of the ectoparasite and the creation of conditions for their survival and increased skin damage, and subsequently spread under favorable conditions on the ground combing.