The Use of Anthelmintic Given at Continuous Low Dosage in Drinking Water to Control Nematodiasis in Calves

  • N. E. Downey
  • J. O’Shea
Part of the Current Topics in Veterinary Medicine and Animal Science book series (CTVM, volume 9)


A number of anthelmintic compounds were found to suppress the faecal output of trichostrongylid eggs or Dictyocaulus viviparus larvae or both when administered at various low dosage levels via the drinking water to artificially infected calves maintained indoors. Under grazing conditions, morantel, levamisole and oxfendazole administered in this fashion to calves during May, June and early July suppressed egg output and this was reflected later in greatly reduced levels of infection on the herbage and in the calves. Calves receiving this system of parasite control achieved excellent liveweight gains. From clinical observations and liveweight data, animals that had undergone the treatment as calves in their first grazing season did not seem to be unduly susceptible to trichostrongylid infection in their second grazing season. Preliminary studies showed that the anthelmintics thiophanate and phenothiazine, administered in the drinking water at low daily dosage, had marked ovicidal and possibly larvicidal effects.


Drinking Water Grazing Season Parasite Control Grazing Experiment Faecal Output 
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Copyright information

© ECSC, EEC, EAEC, Brussels-Luxembourg 1981

Authors and Affiliations

  • N. E. Downey
    • 1
  • J. O’Shea
    • 1
  1. 1.The Agricultural Institute, DunsineaCastleknock, Co. DublinIreland

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