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Khalak , V. 2021. Reproductive qualities of sows of large white breed of different intrabreed differentiation according to the index "level of adaptation" and economic efficiency of their use. Bulletin of Sumy National Agrarian University. The series: Livestock. 1(44) (Mar. 2021), 98-102. DOI:https://doi.org/10.32845/bsnau.lvst.2021.1.14.