INFLUENCE OF MIXED LIGAND COMPLEXES OF ZINC, MANGANESE, COBALT WITH SUPPLEX SE AND COPPER SULFATE AND POTASSIUM IODITE ON THE MILK PRODUCTIVITY OF HIGH-PRODUCTIVE HOLSTEIN BREEDS OF GERMAN SELECTION Journal title: Технологія виробництва і переробки продукції твариннитцва Authors: Yu. G. Kropyvka, V. S. Bomko Subject(s):
