Anthelmintic resistance of gastrointestinal nematodes in dairy calves within a pasture‐based production system of south West Western Australia

M. Mauger; G. Kelly; C.H. Annandale; I.D. Robertson; F.K. Waichigo; J.W. Aleri

doi:10.1111/avj.13162

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Anthelmintic resistance of gastrointestinal nematodes in dairy calves within a pasture‐based production system of south West Western Australia

Journal article

Open access

Peer reviewed

Anthelmintic resistance of gastrointestinal nematodes in dairy calves within a pasture‐based production system of south West Western Australia

M. Mauger, G. Kelly, C.H. Annandale, I.D. Robertson, F.K. Waichigo and J.W. Aleri

Australian Veterinary Journal, Vol.100(7), pp.283-291

2022

DOI: https://doi.org/10.1111/avj.13162

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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 University
G. Kelly (Author/Creator) - Boehringer Ingelheim (Australia)
C.H. Annandale (Author/Creator) - Murdoch University
I.D. Robertson (Author/Creator) - Murdoch University
F.K. Waichigo (Author/Creator) - Brunswick (United States)
J.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: Centre for Biosecurity and One Health; School of Veterinary Medicine; Centre for Animal Production and Health
Language: English
Resource Type: Journal article

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Collaboration types: Industry collaboration; Domestic collaboration; International collaboration
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