Kochuk-Yashchenko , O., Kucher , D., Shapran , I., & Mosiichuk , M. (2020). The efficiency of index selection in herd of the Simental breed for organic milk production. Bulletin of Sumy National Agrarian University. The Series: Livestock, (2 (41), 47-55. https://doi.org/10.32845/bsnau.lvst.2020.2.8