Efficacy of 3 anthelmintics in communally grazed sheep as reflected by faecal egg count reduction tests in a semi-arid area of South Africa.
A survey was conducted on the occurrence of anthelmintic resistance of nematodes in communally grazed sheep in a semi-arid area near Mafikeng, South Africa, from January to March 2006. In the herds belonging to twelve smallholder sheep farmers, the efficacies of albendazole, levamisole and closantel were tested by faecal egg count reduction tests where 80 % efficacy was considered the cut off for anthelmintic resistance. The results of the faecal egg count reduction tests showed more than 80% efficacy with all the drugs used in most cases, but there were notable exceptions. In 1 case, closantel had an efficacy of 72%, albendazole had an efficacy of 68% and levamisole showed efficacies of 58%, 60% and 75% respectively on 4 farms. The occurrence of anthelmintic resistance in this farming sector is of concern and steps should be taken to prevent its further spread and development to avoid a situation developing as on numerous commercial sheep farms in South Africa where resistance is common.
Bakunzi
F R
FR
Department of Animal Health, North-West University, PO Box 1372, Mafikeng, 2745 South Africa. bakunzif@uniwest.ac.za
D015766:Albendazole / Q000494:pharmacology / Q000627:therapeutic use; D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D000871:Anthelmintics / Q000494:pharmacology* / Q000627:therapeutic use; D004351:Drug Resistance; D005243:Feces / Q000469:parasitology; D005260:Female; D006374:Helminthiasis, Animal / Q000188:drug therapy*; D007978:Levamisole / Q000494:pharmacology / Q000627:therapeutic use; D008297:Male; D009348:Nematoda / Q000187:drug effects*; D009349:Nematode Infections / Q000188:drug therapy / Q000662:veterinary*; D010270:Parasite Egg Count / Q000662:veterinary; D021261:Parasitic Sensitivity Tests / Q000662:veterinary; D012458:Salicylanilides / Q000494:pharmacology / Q000627:therapeutic use; D012756:Sheep; D012757:Sheep Diseases / Q000188:drug therapy*; D013019:South Africa; D016896:Treatment Outcome
D000871:Anthelmintics; D012458:Salicylanilides; D007978:Levamisole; C023342:closantel; D015766:Albendazole