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Vet Rec. 2001 Feb 3;148(5):138-41.

Efficacy of moxidectin 2 per cent gel against naturally acquired strongyle infections in horses, with particular reference to larval cyathostomes.

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  • 1Department of Veterinary Parasitology, University of Glasgow Veterinary School.


The efficacy of moxidectin 2 per cent equine gel against naturally acquired strongyle infections was assessed in 18 ponies which had grazed on contaminated pasture before being housed for eight weeks. Twenty-four hours before the treatment, two randomly selected ponies were euthanased and their worm burdens were determined. Eight of the remaining 16 ponies were treated with moxidectin 2 per cent gel while the other eight were given a placebo gel. Eight weeks later the 16 animals were necropsied and their worm burdens established. A 100 per cent efficacy was recorded against adult and lumenal L4 cyathostomes and adult Strongylus and Triodontophorus species. Digest recoveries of larval cyathostomes indicated a 90.8 per cent (P<0.002) reduction in early L3 and a 99.9 per cent (P<0.001) reduction in developing stages. There was a reduction in faecal egg output of between 96 and 100 per cent in the treated animals compared with the controls.

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