Ladyka , V., Sklyarenko , Y., Pavlenko , Y. and Malikova , A. 2021. Peculiarities of formation of genealogical structure of Ukrainian Black-and-White dairy breed in Sumy region and research of its influence on the genotype of cows by β-casein. Bulletin of Sumy National Agrarian University. The series: Livestock. 1(44) (Mar. 2021), 3-10. DOI:https://doi.org/10.32845/bsnau.lvst.2021.1.1.