title: Efficacy of a topical formulation of ivermectin against naturally acquired gastro-intestinal nematodes in weaner cattle.
abstract: The efficacy of a topical formulation of ivermectin against naturally acquired gastro-intestinal nematodes in weaner cattle was evaluated. At slaughter, 14-15 days after treatment, burdens of Ostertagia spp, Trichostrongylus axei and Oesophagostomum radiatum were significantly lower in the treated calves than in the untreated controls (p<0.01). Efficacies (based on geometric mean worm burdens of treated and control groups) were 99.6%, 95.1% and 100% respectively. The sizes of the Cooperia spp and Trichuris ovis burdens in the treated group did not differ significantly at the 5% level of confidence from those in the control group.
authors: Wallaceville Animal Research Centre, MAFTech, Ministry of Agriculture and Fisheries, P.O. Box 40-063, Upper Hutt.
authors: S A
authors: SA
authors: Bisset
authors: R V
authors: RV
authors: Brunsdon
authors: S
authors: S
authors: Forbes