TROKHYMENKO, V. Z.; KOVALCHUK, T. I.; ZAKHARIN, V. V.; BEZVERKHA, L. M.; MAMCHENKO, V. Y. REPRODUCTIVE ABILITY, PRODUCTIVITY AND QUALITY OF COWS’ MILK AFTER THE APPLICATION OF A BIOLOGICALLY ACTIVE PREPARATION. Bulletin of Sumy National Agrarian University. The series: Livestock, n. 3, p. 71-77, 31 Oct. 2023.