Khalak, Viktor Ivanovych, Bohdan Volodymyrovych Hutyi, and Oleksandr Mykolaiovych Bordun. 2022. “ZOOTECHNICAL EVALUATION AND ECONOMIC EFFICIENCY OF USING SOWS OF DIFFERENT INTRABREED DIFFERENTIATION ACCORDING TO SOME MATHEMATICAL MODELS AND SELECTIONAL INDICES”. Bulletin of Sumy National Agrarian University. The Series: Livestock, no. 1 (July), 72-78. https://doi.org/10.32845/bsnau.lvst.2022.1.11.