For citations:
Gnezdilova L.A., Muradyan Zh.Yu., Kruglova Yu.S., Rozinsky S.M. Study of the effect of betulin-containing feed additive on lysozyme and bactericidal activity of blood serum of calves and dairy cows. Agrarian science. 2025;(9):30-37. (In Russ.) https://doi.org/10.32634/0869-8155-2025-398-09-30-37