Verbelchuk , Tetiana, Serhii Verbelchuk, Iryna Kovalchuk, Igor Kovalchuk, Ruslan Vasiliev, and Vasily Klim. 2021. “Balance of Ferum and Copper in the Organs of Pigs When Using Non-Traditional Natural Additives”. Bulletin of Sumy National Agrarian University. The Series: Livestock, no. 2 (45) (May), 77-82. https://doi.org/10.32845/bsnau.lvst.2021.2.11.