New maternal line of the Cornish breed of the “Smena” selection and genetic center Zh. V. Emanuylova, A.V. Egorova, D. N. Efimov and A.A. Komarov E3S Web Conf., 262 (2021) 02003 Published online: 24 May 2021 DOI: 10.1051/e3sconf/202126202003