Comparative evaluation of russian black pied and holstein cattle breeds of foreign breedingO.V. Gorelik, А.S. Gorelik, M.A. Tokoreva, N.I. Sorokina, G.V. Mkrtchyan and O.M. MukhtarovaE3S Web Conf., 282 (2021) 03009DOI: https://doi.org/10.1051/e3sconf/202128203009