TY JOUR TI THE INFLUENCE OF VITAMIN AND MINERAL AND ENZYME PROBIOTICAL FEED ADDITIVES ON PHYSIOLOGICAL FEATURES AND EFFICIENCY OF BULL-CALVES OF HEREFORD BREED IN THE CONDITIONS OF THE AMUR REGION KW microelements KW enzyme probiotical KW living mass KW coefficients of digestibility KW the biochemical indices of the blood KW slaughter mass KW economics effectiveness JO Bulletin of KSAU AU Murashkin, D.E. AU Arnautovsky, I.D. PY 2015 IS PB Krasnoyarsk State Agrarian University