Pelekhaty , M., Kochuk-Yashchenko , A., Kucher , D. and Novosad , V. (2020) “Bull’s role in improving the economic useful traits of their offsprings”, Bulletin of Sumy National Agrarian University. The series: Livestock, (1 (40), pp. 17-24. doi: 10.32845/bsnau.lvst.2020.1.3.