Ramazanovich Feyzullayev, Feyzullah, Vadim Anatolyevich Babushkin, Anatoly Vladimirovich Bakai, and Tatiana Viktorovna Lepekhina. 2018. “Milk Productivity of Black-Motley Cows With Easy and Troubled Calvings”. International Journal of Engineering & Technology 7 (4.38): 1115-17. https://doi.org/10.14419/ijet.v7i4.38.27653.