Developments of red steppe breed heifers and its hybrids with Holstein in the period of pregnancy and after calvingPatimat Aligazieva, Gyulkhanum Dabuzova, Habib Kebedov, Abdula Aligaziev and Ibragim AbdulaevE3S Web Conf., 203 (2020) 01011DOI: https://doi.org/10.1051/e3sconf/202020301011