In terms of industrial technology, a significant amount of pre- and probiotic preparations have been proposed for growing calves. Therefore, conducting research on the effectiveness of their effects on the body of calves, the appropriateness of the application and determination of economic efficiency in their implementation are of scientific and practical interest. In research and production experience used 50 calves analogs, whose age at the beginning of the experiment was from five to ten days. Two groups of Holstein calves were formed: experimental and control, 25 animals each. The average live weight at birth of calves was 35.53 ± 0.91 and 36.75 ± 0.77 kg, respectively. Used zootechnical, zoohygienic, biochemical, physico-chemical, economic and statistical research methods. The positive effect of probiotics protecto-asset on preservation, increase in live weight, interior performance indicators of experimental animals, the quality of beef obtained during their slaughter, the biological value of meat and the profitability of production have been established. Oral application of the probiotic preparation protecto-active in the process of growing calves of an early age ensured their 100% safety and made significant savings of resources for the farm due to the economic efficiency of the probiotic, namely: large gains in live weight of calves provided a net profit of 10.1 % compared to with the increase in animals of the control group (6480.1 UAH. against 5886.7 UAH. respectively). The cost of 1 kg increase in live weight of experienced calves was less by 1.39 UAH. against calves of the control group (9.86 UAH. versus 11.25, respectively), profit is 1 UAH. costs were 1.2 times higher and amounted to 1.39 UAH. in the production of beef (7.64 UAH. against 6.25 UAH, respectively), the level of profitability is more by 9.6 %, which makes the probiotic protectoasset attractive for its use as a feed additive in the process of growing calves of an eary age
dairy cattle breeding, specialization, production intensification, early weaning, probiotic, productivity, quality of beef, profitability
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