State of humoral immunity in lactating sows and suckling piglets Aleksey G. Shakhov, Sergey V. Shabunin, Larisa Yu. Sashnina, Yuliya Yu. Vladimirova and Mariya Yu. Zheynes BIO Web Conf., 36 (2021) 06018 Published online: 01 October 2021 DOI: 10.1051/bioconf/20213606018