Oliyar, A. V.; Skliarov, P. M.; Masiuk, D. M.; Bilyi, D. D.; Logvinova, V. V.; Lieshchova, M. A. Effect of β-Mannanase Enzyme Supplementation on the Morphofunctional State of Broiler chickens’ Immunocompetent Organs . Regul. Mech. Biosyst. 2020, 11, 579-587.