Productivity and morphological indicators of egg quality of meat hens of maternal lines of the Cornish and Plymouth Rock breeds of the new Smena-9 crossJ. V. Emanuilova, A. V. Egorova, D. N. Efimov and A. A. KomarovBIO Web Conf., 48 (2022) 03006DOI: https://doi.org/10.1051/bioconf/20224803006