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Anthelmintic efficacy on stud farms in England

V. E. Relf, H. E. Lester, E. R. Morgan, J. E. Hodgkinson, J. B. Matthews

WIDESPREAD use of anthelmintic treatments in horses can lead to resistance developing in nematode populations. This study aimed to assess the efficacy of the four main broad spectrum anthelmintic drugs on thoroughbred stud farms in England.

Sixteen stud farms from across England were included in the study. Faecal egg count (FEC) tests were performed on horses from each of the yards. Faecal egg count reduction tests (FECRTs) were then performed on horses found to be excreting more than 40 eggs per gram of faeces (EPG). After faecal samples had been collected, the horses were treated with either ivermectin, moxidectin, pyrantel or fenbendazole. Faecal samples were again taken and analysed between 14 and 17 days after anthelmintic treatment.

Moxidectin FECRTs were performed on 131 individual horses and 11 groups of horses from seven stud farms, and egg counts were reduced by over 95 per cent in all of them. Ivermectin FECRTs were performed in 179 individual horses and 18 groups of horses from 12 farms: in a group of yearlings at one site, two horses had high FECs 14 days after treatment, but the authors note that this may have …

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