Influence of the premix Reya in calves' diets on their immune status and productivity

The aim of the study is to investigate the effect of the premix REYA in calf diets containing vitamins B, C, H, minerals, plant extract acting as an effective immunomodulator, and probiotics of the Bacillus subtilis strain on the productivity and physiological state of young Holstein cattle. The study examined the effect of this premix on immunity, physiological state, live weight gain, as well as the duration and nature of diarrhea treatment. The experiment was conducted in 2024 in the Belgorod Region at the enterprise MK LLC Borisovskie Fermy. The object of the study was 30-day-old Holstein calves with diarrhea. Two groups of 12 animals were selected for the study: the 1st is the control group and the 2nd is the experimental group. The animals of the control group were fed the rations accepted on the farm, while the animals of the experimental group were additionally given the premix REYA in the amount of 60 g per head daily for 45 days. The premix was introduced during drinking. In the course of the study, the animals were examined and their physiological condition was monitored. The results of the study showed that the use of this premix can increase immunity, reduce the duration of treatment for diarrhea, and an improvement in blood composition was also noted, namely an increase in hemoglobin levels by 11.6 %, glucose by 1.97, and erythrocytes by 3.73 %. The leukocyte index was reduced by 12.9 %. The study revealed an increase in the live weight gain of young animals by 8.3%.