Kovalenko, G. S., S. V. Priyma, G. A. Holosa, A. V. Tuchyk, L. V. Marchuk, V. P. Otsabryk, and B. B. Lolya. “Characteristics of Reproductive Ability of Cows Ukrainian Red-and-White Dairy Cattle and Ukrainian Black-and-White Dairy Cattle and Holstein Breeds in SERF ‘Oleksandrivske’”. Animal Breeding and Genetics 550 (May 15, 2018): 196-200. Accessed September 20, 2019. https://abg-journal.com/index.php/journal/article/view/184.