Ramazanovich Feyzullayev, F., Anatolyevich Babushkin, V., Vladimirovich Bakai, A., & Viktorovna Lepekhina, T. (2018). Milk Productivity of Black-Motley Cows with Easy and Troubled Calvings. International Journal of Engineering & Technology, 7(4.38), 1115-1117. https://doi.org/10.14419/ijet.v7i4.38.27653