Abstract
To date, the swine reproductive and respiratory syndrome virus (RRSS) has been registered in most countries of the world, including Russia. This disease remains one of the important problems in pig breeding, as it causes huge losses to this industry. The authors conducted a study where epizootological data and clinical signs of the incidence of RRSS in the conditions of the breeding farm "Zadneprovsky" and materials for evaluating the effectiveness of RRSS vaccine prevention with an analysis of economic indicators. The diagnosis of RRSS was made on the basis of clinical, pathoanatomic and serological research methods. By the number of antibodies in the blood serum of animals, the intensity of immunity to the RRSS virus was judged. Virus-specific antibodies were determined by enzyme immunoassay (ELISA). It is established that if the virus appears in the herd for the first time, all sows with impaired reproductive function, accompanied by 100% abortions, premature birth, become ill. Among the piglets born from sick sows, there are a large number of stillbirths, and among the surviving piglets, there is a high mortality rate, stunting and unsuitability for cultivation. It is noted that the number of stillborn piglets is always higher in the first moments of the onset of the disease than with repeated farrowing. After getting over the disease, the bulk of sows quickly recover and, with repeated farrowing, bring viable piglets. Immunization of piglets against the background of a decrease in maternal immunity with a live vaccine against RRSS is accompanied by the formation of a tense immunity that protects them from the disease. Currently, in many pig farms, vaccination of pigs against RRSS is included in the mandatory program of preventive vaccinations against infectious diseases.