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Studies were carried out in 2003/04 and 2004/05 on 28-53 cows of Black-and-White (bwl) as well as 50-61 of Polish Red (pr) breed. Hair from the base of tail and neck was combed once a month from October to April. Samples were weighed in the laboratory, then the material was divided into portions and, using a magnifying glass, mallophagans and its eggs were counted. The intensity of the invasion was...
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