@article{Yudina2019productive,
author={Yudina, O.P. and Usova, T.P. and Sapegina, E.V.},
title={PRODUCTIVE LONGEVITY OF HOLSTEIN COWS DEPENDING ON THE  GENOTYPE OF THE BULL BY KAPPA-CASEIN GENE AND COUNTRY OF ORIGIN},
journal={Bulletin Samara State Agricultural Academy},
publisher={Samara State Agrarian University},
year={2019},
pages={64-69},
volume={4},
issue={3},
}