The feasibility of using a probiotic to increase the egg productivity of chickens Olga Krotova, Olga Sangadzhieva, Olga Kedeeva, Kermen Khalgaeva and Amulanga Manzhikova E3S Web Conf., 363 (2022) 03042 Published online: 14 December 2022 DOI: 10.1051/e3sconf/202236303042