Ecogenesis of organs and tissues formation of in cattle in the embryonic period Nikolay Fenchenko, Nazira Hairullina, Albina Aminova, Munir Sabitov and Fanus Shagaliev E3S Web Conf., 175 (2020) 03016 Published online: 29 June 2020 DOI: 10.1051/e3sconf/202017503016