Abstract
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.
Highlights
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 South Africa, anthelmintic resistance has become a major problem in commercial sheep farming
Similar anthelmintic resistance problems have been reported on commercial sheep farms in Zimbabwe[4] and many other parts of the world[1,3,6,7,8,9] The available literature indicates little about the degree of resistance of nematodes to the commonly used anthelmintics in communally grazed small ruminants in South Africa with the exception of that reported in the resource-limited communal grazing area of Lebowa[12] and Mafikeng[2,11] and on a farm at Rust de Winter[17]
Summary
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. Bakunzi F R Efficacy of 3 anthelmintics in communally grazed sheep as reflected by faecal egg count reduction tests in a semi-arid area of South Africa. In South Africa, anthelmintic resistance has become a major problem in commercial sheep farming.
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