Khmelnychyi, Leontiy, and Dmitriy Bardash. “Features of Development Repair Heifers Ukrainian Red-and-White and Black-and-White Dairy Breeds in the Farms of Sumy Region”. Bulletin of Sumy National Agrarian University. The series: Livestock, no. 1-2(36-37) (July 1, 2019): 15-20. Accessed May 3, 2024. https://www.snaubulletin.com.ua/index.php/ls/article/view/74.