TY JOUR TI HEIFERS OF DIFFERENT PRODUCTIVE DIRECTIONS BLOOD MORPHO-BIOCHEMICAL PROFILE IN THE PRE-CALVING PERIOD KW heifers KW metabolism KW blood KW Holstein breed KW Hereford breed JO Bulletin of KSAU AU Maikova, N.N. AU Scherbinina, S.A. AU Ostyakova, M.E. AU Irkhina, V.K. PY 2022 IS 0 PB Krasnoyarsk State Agrarian University