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Field study of the efficacy of halofuginone and decoquinate in the treatment of cryptosporidiosis in veal calves

¹ Centre Hospitalier Universitaire Vétérinaire de St-Hyacinthe, 3200 Rue Sicotte, St-Hyacinthe, Québec J25 7C6 SC, Canada
² Délimax-Vigortone, 3700 Boulevard Laframboise, St-Hyacinthe, Québec J2R 1L1, Canada

Correspondence: Correspondence to Dr Dubreuil

Ninety, seven- to 10-day-old calves were allocated to three groups of 30 and treated daily for seven days with either 100 µg/kg halofuginone hydrobromide or 2·5 mg/kg decoquinate orally or left untreated as controls. The levels of diarrhoea and dehydration were monitored daily for 28 days from the first day of treatment (day 0) and samples of faeces were collected on days 0, 7, 14, 21 and 28, to quantify the excretion of Cryptosporidium parvum oocysts. The calves were weighed on days 3 and 28. The treatments had no effect on the levels of diarrhoea or dehydration, the proportions of diarrhoeic calves or the proportions of calves shedding oocysts. However, unlike decoquinate, halofuginone significantly reduced the excretion of oocysts on day 7 (P<0·0001), and decoquinate increased the average daily weight gain of the calves (P=0·049).