FIELD: veterinary science, prophylaxis. SUBSTANCE: 20-30-d-aged animals are subcutaneously injected with T-activin at the dosage of 4 mcg/kg or 0.04 ml/kg 0.01%-solution and B-activin at the dosage of 6 mg lyophilized powder dissolved with 0.01%-T-activin solution, once daily for 3 d followed by animal testing according to immunodiffusion test. The method provides to keep immune system activity and natural resistance within physiological norm during 12 mo and prevent leucosis in cattle. EFFECT: higher efficiency. 2 tbl
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Authors
Dates
2002-09-10—Published
2000-02-24—Filed