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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 2021, 23, 82-86.