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The results of the production approval fully confirmed the high efficiency of introducing the feed additive "Butaselmevit-plus" into the compound feed for piglets. It was established that at the end of the piglet rearing period (at the age of 75 days), the average weight of one head in the experimental group was 32.6 kg, which is 1.1 kilograms or 3.5% higher (P < 0.05). Then their peers from the control group. During the period of rearing, the absolute increase in body weight in young animals of the experimental group was higher by 1.2 kg, or by 4.7 %, and the average daily weight gain by 21.8 g, or by 4.7 %, compared to similar indicators in piglets of the control group, and were 26.5 kg and 481.8 g, respectively. Among the numerous indicators determining the economic efficiency of production, the cost per unit of production is considered the most important. One of the reserves for reducing the cost of pig production is increasing young animals' productivity and preservation. The above results of the production inspection convincingly prove that using the feed additive "Butaselmevit-plus" in compound feed for piglets at the rate of 100 mg/kg of body weight increases their product qualities and, as a result, improves economic indicators. In the experimental group, the cost of 1 kg of live weight of piglets during rearing decreased by UAH 0.57, or 3.0 %, compared to the young of the control group and amounted to UAH 18.25. The cost of 1 kg of live weight gain in control and experimental groups was slightly higher (23.44 and 22.46 UAH, respectively), and the difference in favor of the latter was 4.2 %. The decrease in the unit cost of production in the experimental group was due to the increase in body weight and the survival of young pigs during the rearing period. The economic effect of using the feed additive "Butaselmevit-plus" as part of compound feed, calculated per 1 head of young pigs, was UAH 25.97 at the prices set for feed and feed additive in 2019. To increase the adaptability of piglets at an early age when weaning from the sow and to prevent the development of oxidative stress, for further maintenance during the period of rearing and fattening, it is recommended to use the feed additive "Butaselmevit-plus" in the amount of 100 mg/kg of body weight per day together with concentrates diet in the period from 21 to 40 days of age. [ABSTRACT FROM AUTHOR]