Moxidectin Effective at Reducing Small Strongyle Egg Counts

Moxidectin was 99.9% effective, while fenbendazole was only 41.9% effective 14 days post-treatment.
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Protect your horses from parasites this spring with an effective dewormer. A recent study showed that moxidectin gel was 99.9% effective at reducing small strongyle egg counts on a herd of embryo transfer recipient mares compared with fenbendazole, which was only 41.9% effective 14 days post-treatment.

“The only two active ingredients labeled to kill the dormant stage of small strongyle worms are moxidectin and fenbendazole,” explained study’s author Nathan Voris, DVM, senior Equine Technical Services veterinarian for Zoetis. "This study provided an apples-to-apples comparison to find the most-effective protection against this equine parasite in the adult horse. While we anticipated a certain amount of resistance to the fenbendazole product, the results far surpassed our initial expectations.”

The study, published in the Oct. 15, 2014, issue of the Journal of the American Veterinary Medical Association, investigated horses from various geographies in the United States. Study results were based on suppression of fecal egg counts (FEC) to help understand the biologic impact of anthelmintic treatment choice on parasite egg shedding and pasture contamination created by the herd

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