The purpose of the study is to determine the most effective treatment regimen for cows with serous-fibrinous mastitis. Objectives: conducting a comprehensive diagnosis of the cow population at the enterprise and identifying among them animals with clinical mastitis; comparison of treatment regimens for cows diagnosed with serous fibrinous mastitis; determining the most effective treatment regimen for the disease on the farm. Objects of study: cows, treatment regimens for mastitis. Research methods: clinical, laboratory studies of livestock and identification of animals with mastitis among them; conducting a comparative analysis of mastitis treatment regimens and determining the most effective one. At the enterprise, the cows were diagnosed with mastitis. 3 treatment regimens for serous-fibrinous mastitis were developed based on the sensitivity of the milk microflora in cows with mastitis to various antibiotics. In the 1st experimental group of animals, the treatment regimen was an antibiotic of the cephalosporin group – Ceftonit, Cobactan LC (1 syringe in the udder tank), NSAID – Flunex. In the 2nd – an antibiotic of the group of semi-synthetic penicillins – Amoxicillin, Gamaret (1 syringe in the udder tank), NSAIDs – Flunex. In the 3rd – a combination of an antibacterial drug of the tetracycline group – Nitox, Mastiet forte (1 syringe in the udder tank), NSAID – Flunex. As a result of comparing treatment regimens in three experimental groups, it was possible to identify the most effective one. When using the 3rd treatment regimen for cows, the most effective therapeutic effect was obtained, but in terms of the cost of drugs, the regimen turned out to be the most expensive. However, if we take into account the economic costs of milk loss while waiting for antibiotics to be removed from the cows’ bodies, the scheme is more effective.