TY JOUR TI CORRECTION OF RUMEN DIGESTION INDICATORS AND CARBOHYDRATE COMPOUNDS METABOLISM IN FIRST–CALF HEIFERS UNDER CONDITIONS OF BIOGEOCHEMICAL PROVINCE KW first-calf heifers KW biogeochemical province KW heavy metals KW volatile fatty acids KW glycolysis JO Bulletin of KSAU AU Gertman, A.M. AU Maksimovich, D.M. PY 2023 IS 0 PB Krasnoyarsk State Agrarian University