TY JOUR TI ESSENTIAL PROBLEMS OF FODDER QUALITY EVALUATION AND STANDARDIZATION KW forage KW quality KW sampling KW the analysis KW detergents KW IK-spectroscopy KW in vitro digestibility JO Adaptive Fodder Production AU Popov, V.V. PY 2022 IS 2021 PB Federal Williams Research Center of Forage Production and Agroecology