Khmelnychyi , Serhii, Bogdan Karpenko, and Dmitryi Bardash. “PECULIARITIES OF DEVELOPMENT OF UKRAINIAN REPAIR HEIFERS RED-AND-WHITE AND BLACK-AND-WHITE DAIRY BREEDS IN FARMS OF SUMY REGION”. Bulletin of Sumy National Agrarian University. The series: Livestock, no. 2 (41) (October 26, 2020): 18-23. Accessed April 26, 2024. https://www.snaubulletin.com.ua/index.php/ls/article/view/193.