EFFICACY OF MOXIDECTIN 2-PERCENT ORAL GEL AGAINST 2ND-INSTAR AND 3RD-INSTAR GASTEROPHILUS INTESTINALIS DE-GEER

In a trial designed to evaluate the efficacy of the recommended dosage of moxidectin 2% oral gel against the gastric stages of Gasterophilus spp., 14 ponies were selected from a herd on the basis of the inclusi on criterion of the presence of Gasterophilus spp. eggs attached to th eir hair coats. After random allocation, the ponies were treated with 1 of 2 treatments, moxidectin 2% equine gel in a single dose at the co mmercial dosage of 400 mu g moxidectin/kg body weight or placebo gel. The animals were necropsied 14 days posttreatment. Efficacies against second-and third-instar Gasterophilus intestinalis De Geer were 100% a nd 99.5%, respectively.