Effectiveness of the Combined Use of Microelements and Tetravit in Calves of the Dairy PeriodAlexey Trebukhov, Elena Shaganova, Yulia Chekunkova, Nadezhda Momot and Yulia KolinaBIO Web Conf., 42 (2022) 01027DOI: https://doi.org/10.1051/bioconf/20224201027