Abstract
In a dairy cow herd consisted of herd of 200 lactating Holstein-Friesian cows and heifers, clinical signs of mastitis in 40 out of 170 animals were observed. Treatments with antibiotics were proved ineffective. Milk bacterial cultures from 15 affected animals revealed Pseudomonas aeruginosa. An autogenous vaccine was administered subcutaneously, twice in a month period, to all adults. Cases of clinical mastitis declined significantly (p⟨0.0001) during next 3 months.
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