PROBIOTICS EFFECT ON CALVES’ GROWTH AND DEVELOPMENT IN PSOROPTOTIC INVASION

The aim of the study is to evaluate the effectiveness of probiotics on the growth and development of calves with psoroptosis. Objectives: to study the dynamics of live weight gain in calves receiving probiotics during psoroptosis treatment; to evaluate calf measurements; to study the clinical and hematological parameters of calves with psoroptosis using probiotics. The study was conducted from 2020 to 2024 at the Department of Morphology, Physiology, and General Pathology and in the laboratory of the Northern Trans-Urals State Agrarian University. The scientific novelty lies in the study of the effect of Olin and Vetom 1.1 probiotics on body weight, basic measurements, and hematological status of calves during the recovery period after psoroptosis treatment. The object of the study was Black-and-White cattle (calves) owned by agricultural enterprises in the Tyumen Region. The diagnosis of psoroptosis was based on clinical signs and microscopic examination results. To study the effectiveness of probiotics for this infestation, calves were divided into groups based on the analog principle. Complete blood counts were analyzed using an Abacus Junior hematology analyzer. Psoroptosis primarily affects calves aged 2 to 9 months, with an infestation prevalence of 13.2–17.3 %. In calves supplemented with probiotics, average daily weight gain increased by 24.52–27.2 %. Linear measurements (withers height, rump height, chest girth, chest depth, chest width, oblique body length, and hip width) were significantly higher in the experimental animals by an average of 7–10 % compared to the control group. Calves in the experimental groups showed increased red blood cell counts and hemoglobin levels, while white blood cell counts decreased by an average of two times compared to the control group.