For citations:
Frolov A.V., Ruzina A.V., Vasyukov N.V., Rozhdestvenskaya T.N. Vaccination activity against avian influenza subtype H9 and Newcastle disease during immunization of egg-laying chickens. Agrarian science. 2025;1(4):34-39. (In Russ.) https://doi.org/10.32634/0869-8155-2025-393-04-34-39