KucherD. М., and DidkovskyA. М. “FERTILITY AND PRODUCTIVITY OF FIRST-CALF COWS OF UKRAINIAN BLACK-AND-WHITE DAIRY BREED”. Animal Breeding and Genetics 570 (April 24, 2019): 79-86. Accessed January 18, 2022. https://abg-journal.com/index.php/journal/article/view/224.