FIELD: veterinary microbiology and biotechnology.
SUBSTANCE: method consists in hyperimmunization of bulls producers with polyvalent antigen followed by sampling blood, separating serum and preserving it, said polyvalent antigen being the one containing cultures of causative agents of colibacteriosis (escherichiosis), salmonellosis, and klebsiellosis and the following proportions of cultures being engaged (in 1 L physiological solution): colibacteriosis causative agents culture 5×1012-6×1012, salmonellosis causative agents culture 5×1012-6×1012, klebsiellosis causative agents culture 5×1012-6×1012, formalin 2.9-3.2 ml.
EFFECT: increased therapeutical and prophylactic properties.
3 cl, 4 tbl, 5 ex
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