Anthelmintic resistance (AR) in sheep gastro-intestinal nematodes has been reported worldwide. In this study, frequency of treatment, drench-and-shift pasture management, and use of long-acting formulations were positively associated with AR, while there was conflicting evidence on mixed-species grazing. Scant evidence was found on the association between AR and other commonly recommended practices, such as rotation of drug classes or use of combination anthelmintics, suggesting the need for furtherresearch. The findings also highlight the need to improve study designs and reporting of research in the field of veterinary parasitology, so results can be used to support evidence-based decisions regarding AR management.
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