Serological epizootic monitoring for infectious diseases in cattle

The use of laboratory diagnostic methods considering endo- and exoecological features of parasitocenoses of various body systems provides either to fully clarify the epizootic situation in contamination enterprises, to identify the sources of causative agent, transmission factors, ways and mechanisms of infection and to develop effective measures for control and prevention of infectious diseases. Studies that had been conducted in the period 2015-2016 in some farms of the Omsk region involved serological laboratory diagnostic methods to detect antibodies and antigens of infectious agents in cattle. The article describes the study material on microparasitocenoses in calves' respiratory and digestive systems, the reproductive system of cows and bulls, and calving cows' udder secretion. Contamination of calves, cows, heifers and stud bulls with antigen pathogens of Chlamydia, Q-fever, leptospirosis, listeriosis, IRT-PV and campylobacteriosis was established. It was found that in young cattle contamination occurs intrauterinally and during calving - when passing through cow's infected reproductive organs. Principal pathogens transmission factors are found colostrum and milk from infected cows, with the newborn calves are infected predominantly alimentary. Carriers of chlamydia in the farms are birds that fix themselves in the livestock buildings and excrete the pathogens with manure. Contamination of animals with Leptospira and Listeria occurs through stagnant water basins, and rats and mice which are considered to be vectors of these contagious diseases as well. In order to eliminate the causes of infection in cattle farms of the Omsk region it is necessary to carry out exoecological (external habitat) and endoecological (internal microhabitat) epizootic activities.