TY JOUR TI Metabolic changes in the organism of laying hens when using antibiotics and phytobiotics KW phytobiotics KW antibiotics KW metabolic effects KW laying hens KW antimicrobial action JO Agrarian Bulletin of the AU Bespamyatnyh, E.N. AU Krivonogova, A.S. AU Isaeva, A.G. AU Donnik, I.M. AU Chencova, A.E. PY 2023 IS 236 PB Ural State Agrarian University