Journal article
Anthelmintic resistance of gastrointestinal nematodes in dairy calves within a pasture‐based production system of south West Western Australia
Australian Veterinary Journal, Vol.100(7), pp.283-291
2022
Abstract
The objective of this study was to determine the prevalence of gastrointestinal nematodes among post-weaned calves aged between 4 and 12 months old within a pasture-based system of south west Australia and quantify the level of anthelmintic resistance. Pre-treatment FECs were monitored on 14 dairy farms. Anthelmintic resistance was assessed on 11 of the farms. Control FECs were compared with anthelmintic FECs at 14 days post-treatment with doramectin (injectable), levamisole (oral), fenbendazole (oral) and a levamisole/abamectin combination (pour-on). Results demonstrate a strong level of anthelmintic resistance, with at least one class of anthelmintic failing to achieve a 95% reduction in FEC in one or more gastrointestinal nematode species. Doramectin was fully effective against Ostertagia, but C. oncophora displayed resistance in 91% of the farms. Conversely, levamisole was fully effective against C. oncophora, but Ostertagia displayed resistance in 80% of the farms. Fenbendazole resistance was present in both C. onocphora and Ostertagia in 64% and 70% of the farms, respectively. Trichostrongylus showed low resistance, occurring in doramectin (14%) and levamisole/abamectin combination (14%). This study confirms that anthelmintic resistance is common. Regular FEC reduction testing is recommended to monitor and guide decision-making for appropriate anthelmintic usage.
Details
- Title
- Anthelmintic resistance of gastrointestinal nematodes in dairy calves within a pasture‐based production system of south West Western Australia
- Authors/Creators
- M. Mauger (Author/Creator) - Murdoch UniversityG. Kelly (Author/Creator) - Boehringer IngelheimC.H. Annandale (Author/Creator) - Murdoch UniversityI.D. Robertson (Author/Creator) - Murdoch UniversityF.K. Waichigo (Author/Creator) - BrunswickJ.W. Aleri (Author/Creator) - Murdoch University
- Publication Details
- Australian Veterinary Journal, Vol.100(7), pp.283-291
- Publisher
- Wiley-Blackwell
- Identifiers
- 991005541566707891
- Copyright
- © 2022 The Authors.
- Murdoch Affiliation
- School of Veterinary Medicine
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Industry collaboration
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- Citation topics
- 1 Clinical & Life Sciences
- 1.163 Parasitology - General
- 1.163.1022 Anthelmintic Resistance
- Web Of Science research areas
- Veterinary Sciences
- ESI research areas
- Plant & Animal Science