Frequency distribution of polymorphic variants of the beta-casein locus in Russian various breed cattle subpopulationsNatalia Kovalyuk, Elena Shiryaeva, Lyudmila Yakusheva, Vladimir Kaishev and Zaurbek AisanovE3S Web Conf., 262 (2021) 02020DOI: https://doi.org/10.1051/e3sconf/202126202020