System of prevention of gynaecological diseases in high-productive cows under in a farm in the Udmurt RepublicRoman Rudakov, Liliya Khamitova, Anastasiya Metlyakova and Vyacheslav MilaevBIO Web Conf., 27 (2020) 00094DOI: https://doi.org/10.1051/bioconf/20202700094