An experimental field study on the build up of lungworm infections in cattle

M. Eysker, J.H. Boersema, J.B.W.J. Cornelissen, F.N.J. Kooyman, W.A. de Leeuw, H.W. Saatkamp

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    7 Citations (Scopus)

    Abstract

    The build up of lungworm infections was studied in four groups of calves. Calves of Group 1 were infected experimentally with 6 x 10 larvae during the first 3 weeks after turnout. The pasture of Group 2 was contaminated with approximately 35,000 larvae in June and the pasture of Group 3 with approximately 1.3 million larvae in August. Group 4 served as the helminth free control group for challenge infections with 5,000 larvae in October. In Group 1 faecal larval counts increased 5 weeks after the beginning of patency and decreased after another 3 weeks, indicating the development of immunity after the second lungworm generation. In contrast, the development of immunity in Groups 2 and 3 occurred after the first lungworm generation as maximal faecal larval counts were seen within 3.5 weeks after the beginning of patency. Infection levels were highest in Group 3 which was the only group showing clinical signs. These signs became worse after oxfendazole treatment.
    Original languageEnglish
    Pages (from-to)144-147
    JournalVeterinary Quarterly
    Volume16
    Issue number3
    DOIs
    Publication statusPublished - 1994

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