Shortened egg reappearance after ivermectin or moxidectin use in horses in the UK

Daniels, Simon (2016) Shortened egg reappearance after ivermectin or moxidectin use in horses in the UK. The Veterinary Journal, 218. pp. 36-39.

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This study reports ivermectin and moxidectin egg reappearance periods (ERP) from UK horses with persistently positive faecal egg counts (FEC), defined as positive FEC within the ERP of an anthelmintic post treatment, or where FEC remained positive after the normal ERP post anthelmintic treatment. Earliest ERP recorded for both ivermectin and moxidectin using first positive FEC was 5 weeks. From sixteen moxidectin premises, five displayed egg reappearance from 12 weeks using two further metrics. For moxidectin premises  with only one animal (present or tested), ERP was from 10 weeks when evaluated as one group (n=61). For ivermectin premises the ERP was from 5 weeks. Premises with only one horse (present or tested ), dosed with ivermectin (n=31), analysed as one group, demonstrated egg reappearance from 6 weeks. Findings were in a selected population of UK pleasure horses deemed at high risk of strongyle infection. This field data suggests shortened ERPs following macrocyclic lactone treatment compared to previously published values, 8-10 and >13 weeks respectively, when these drugs were first marketed.

Item Type: Article
Keywords: Egg reappearance, Ivermectin, Moxidectin, Strongyles, Resistance
Divisions: Equine Management and Science
Depositing User: Prof Meriel Moore-Colyer
Date Deposited: 16 Feb 2017 14:23
Last Modified: 19 Oct 2022 15:13

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