Efficiency of combined fodder use with reduced amount of grain in feeding lactating cowsV.S. Zoteev, G.A. Simonov, S.V. Zoteev, A.V. Kirichenko and V.S. NikulnikovE3S Web Conf., 254 (2021) 08003DOI: https://doi.org/10.1051/e3sconf/202125408003