Abstract
In areas with a significant spread of infection, there is a need to immunize animals against bovine brucellosis, especially in prosperous meat farms, where uterine herds are on pasture most of the year and use natural reservoirs. It is also difficult to avoid possible contacts of healthy cattle with animals that are disadvantaged by brucellosis. Immunization of such herds will help to protect animals from infection. This article presents the results of an experimental and production study of the protective properties of a live brucellosis vaccine from the mildly agglutinogenic Brucella abortus strain No. 82 after immunization of heifers, taking into account the technology of beef cattle. The high efficiency of immunization of young cattle of the Kazakh white-headed breed at 7-8 months of age after beating off from mother cows has been established. The usefulness of immune responses and the possibility of unhindered diagnosis of brucellosis after the use of the vaccine from unit 82 were clarified. The antiepizootic effectiveness of immunization of young cattle with the vaccine from unit 82 in the meat sector was proved. This scheme fits into the technology of beef cattle breeding: immunization of heifers with an anti-brucellosis vaccine from strain 82 after they are weaned at 7-8 months of age, followed by revaccination with a vaccine from strain 82 according to the instruction.