TY JOUR TI MILK PRODUCTIVITY AND METABOLISM OF THE FIRST-CALF HEIFERS OF THE KHOLMOGORSK BREED IN THE REDUCED FODDER LEVEL KW first-calf heifers KW Kholmogorsk breed KW digestibility KW milk productivity JO Bulletin of KSAU AU Nikolaeva, N.A. PY 2015 IS PB Krasnoyarsk State Agrarian University