SMETANINA, O. V.; IBATULIN, I. I.; BOMKO, V. S. IMPACT OF MIXED LYGAND COBALT COMPLEX ON DIGESTIBILITY OF NUTRIENTS OF HIGHLY PRODUCTIVE COWS OF HOLSTEIN BREED. Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies. Series: Agricultural sciences, v. 18, n. 1, p. 132-136, 6 mar. 2016.