TY JOUR TI Effect of the probiotic strain Bifidobacterium longum on the content of chemical elements in biological tissues of broiler chickens with a mineral-deficient diet KW probiotic KW broiler chickens KW toxic elements KW deficient diet JO Agrarian Bulletin of the AU Kvan, O.V. AU Sheyda, E.V. AU Duskaev, G.K. PY 2021 IS 0 PB Ural State Agrarian University