Effectiveness of Citarin-L spot on (levamisole) against endohelminths of swine

Wohrl, H.

Die Wirksamkeit von Citarin L spot on gegen Endohelminthen des Schweines: 63


Accession: 000358989

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A levamisole formulation for external application was tested in field trials using 20 sucking piglets, 111 fattening pigs and 164 sows naturally infected with Hyostrongylus, Oesophagostomum, Ascaris and, in a few cases, Metastrongylus, Strongyloides and Trichuris. Levamisole was poured on the back and neck of the animals at doses of 16, 24 and 32 mg/kg. Faecal samples examined two days before and six and twelve days after treatment revealed eggs in about half the sows, even in those given highest dose. In a controlled test, 29 fattening pigs aged 15 weeks were experimentally infected at intervals with Oesophagostomum, Hyostrongylus rubidus and Metastrongylus, and treated with 16 and 24 mg/kg against fourth-stage larvae and adult worms. Levamisole was highly effective only against Metastrongylus, 99% of larval and adult stages being destroyed. Hyostrongylus larvae were destroyed at rates of only 48% and 60%, according to dose, and Oesophagostomum larvae at rates of 76% and 25%. Against adult worms an efficiency rate of 95% was achieved. It is concluded that the levamisole "spot-on" formulation is of only limited value in pigs.