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Mauger M, Kelly G, Annandale CH, Robertson ID, Waichigo FK, Aleri JW. Anthelmintic resistance of gastrointestinal nematodes in dairy calves within a pasture-based production system of south West Western Australia. Aust Vet J 2022; 100:283-291. [PMID: 35383394 PMCID: PMC9542819 DOI: 10.1111/avj.13162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 02/15/2022] [Accepted: 03/20/2022] [Indexed: 11/30/2022]
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.
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Affiliation(s)
- M Mauger
- School of Veterinary Medicine, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Western Australia, Australia
| | - G Kelly
- Boehringer Ingelheim Animal Health Australia Pty. Ltd., North Ryde, New South Wales, Australia
| | - C H Annandale
- School of Veterinary Medicine, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Western Australia, Australia
| | - I D Robertson
- School of Veterinary Medicine, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Western Australia, Australia.,College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - F K Waichigo
- Brunswick Veterinary Services, Brunswick Junction, Western Australia, Australia
| | - J W Aleri
- School of Veterinary Medicine, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Western Australia, Australia.,Centre for Animal Production and Health, Future Foods Institute, Murdoch University, Murdoch, Western Australia, Australia
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Abstract
BACKGROUND Mineral trioxide aggregate, or MTA, is a new material developed for endodontics that appears to be a significant improvement over other materials for procedures in bone. It is the first restorative material that consistently allows for the overgrowth of cementum, and it may facilitate the regeneration of the periodontal ligament. CASE DESCRIPTION The authors present five cases in which MTA was used to manage clinical problems. These included vertical root fracture, apexification, perforation repair and repair of a resorptive defect. In each case, MTA allowed bone healing and elimination of clinical symptoms. CLINICAL IMPLICATIONS Materials such as zinc oxide-eugenol cement and resin composite have been used in the past to repair root defects, but their use resulted in the formation of fibrous connective tissue adjacent to the bone. Because it allows the overgrowth of cementum and periodontal ligament, MTA may be an ideal material for certain endodontic procedures.
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Affiliation(s)
- R S Schwartz
- U.S. Air Force, Dental Corps, Elmendorf Air Force Base, Alaska, USA
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Mauger J, Hoskins JE, Bresh MM, De Lisle DB, Mansell TL, Roberts J, Carey RG, Lukis FC, Corbin MAB, Collenette B, Mauger M, Tranter P, Baines J. To the Committee on Irregular Practice of the Provincial Medical and Surgical Association. West J Med 1851. [DOI: 10.1136/bmj.s1-15.19.531-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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