Mirsaidova Zukhra Shukhratovna and Khujamov Jurabek Naimovich 2023. Study of the External and Internal Characteristics of Holstein Cows of Different Selections Depending on the Type of Constitution. International Journal of Biological Engineering and Agriculture. 2, 9 (Sep. 2023), 87–89. DOI:https://doi.org/10.51699/ijbea.v2i9.2618.