Kropyvka, Y., Bomko, V. and Kropyvka, S. (2021) “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, 23(95), pp. 82-86. doi: 10.32718/nvlvet-a9512.