KROPYVKA, Y.; BOMKO, V.; KROPYVKA, S. The economic efficiency of the use of mixed ligand complexes of Zinc, Manganese and Cobalt in the rations of highlyproductive cows of the Ukrain-ian Red-Spotted Dairy breed. Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies. Series: Agricultural sciences, v. 23, n. 95, p. 82-86, 11 dez. 2021.