THE EFFICACY OF IVERMECTIN (IVOMEC®) AGAINST GASTROINTESTINAL NEMATODES OF SHEEP IN THAILAND

Abstract

Rectal, faecal samples from 14 sheep were collected 3 times a day (morning, noon and evening) and examined for nematode eggs by the formalin-ether, sedimentation technique and the Brine floatation technique. The faecal egg counts were done by using the Stoll’s dilution, egg counting technique. The sheep were injected with ivermectin (Ivomec®) (0.2 mg/kg) subcutaneously. Three weeks later, faecal samples were collected and examined to
determine the outcome of the treatment. It was found that strongyles and Trichuris ovis eggs were absent. It was concluded that Ivomec® showed good efficacy for the treatment of some gastrointestinal nematodes in this study with no adverse effects on the sheep.