Comparison of the cyathostomin egg reappearance times for ivermectin, moxidectin and abamectin in horses in consecutive egg count reduction tests in winter and summer over two years

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Date
2021
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New Zealand Veterinary Association
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Abstract
Shortened cyathostomin egg reappearance periods (ERP) serve as a warning of developing anthelmintic resistance (Scott et al., 2015). Efficacy is thought to have declined more rapidly for the later larval stages (L4) than for the egg laying adults, so that animals still show zero or near zero counts for a period after treatment, but with L4 now surviving treatment the ERP has shortened.
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2021 Conference Proceedings of the e Equine Veterinarians Branch of the NZVA, and Equine Veterinary Nurses of the NZVNA, 2021, pp. 25 - 26 (2)