Biochemical status of the sow body with the use of vitamin and mineral supplement in the dietA.A. Ovchinnikov, L.Yu. Ovchinnikova, Yu.V. Matrosova, D.S. Bryukhanov and E.A. BabichE3S Web of Conf., 222 (2020) 02057DOI: https://doi.org/10.1051/e3sconf/202022202057