Efficacy of selected anthelmintics against gastrointestinal nematodes of sheep owned by smallholder farmers in Wolaita, Southern Ethiopia

The present study was conducted to investigate the efficacy of albendazole, tetramisole and ivermectin against gastrointestinal nematodes of sheep owned by smallholder farmers. Eighty three sheep were selected for the study and divided into four groups: the first group was treated with Albendazole, the second group treated with Tetramisole, the third group with Ivermectin and the fourth group untreated to serve as control. Faecal sample were collected on day zero before treatment, and again on day 10 post treatment. The efficacy for each anthelmintic was measured using the faecal egg count reduction test. The arithmetic faecal egg count reduction for albendazole, tetramisole and ivermectin were 99.34%, 97.77%, and 98.30% respectively. Therefore, the current finding suggests that there is a good state of efficacy for all tested anthelmintics against gastrointestinal nematodes of sheep. Keywords: Anthelmintic, Faecal egg count, Nematodes, efficacy