Productive longevity of white-and-black cows of different genotypes CSN3 and DGAT1Radik Shaidullin, Gazimzyan Sharafutdinov, Anastasia Moskvicheva, Rustam Ravilov and Ismagil KhakimovBIO Web Conf., 17 (2020) 00060DOI: https://doi.org/10.1051/bioconf/20201700060