Shkromada, O., Dudchenko, J., & Udovenko, Y. (1). Probiotic effect on a gastrointestinal microbiocenosis of calves. Bulletin of Sumy National Agrarian University. The Series: Veterinary Medicine, (1 (48), 3-8. https://doi.org/10.32845/bsnau.vet.2020.1.1