Kraevskіy A, Dopa V, Chekan A, Musiienko Y. Age structure of fertilization of heifers and its influence on the frequency of complication of calving in first-calf cow and their culling from the herd . vm [Internet]. 1 [cited 2024May5];(1 (48):23-1. Available from: https://www.snaubulletin.com.ua/index.php/vm/article/view/211