Anthelmintic resistance in ovine gastrointestinal nematodes in inland southern Queensland

OBJECTIVE: To establish the prevalence of anthelmintic resistance in ovine gastrointestinal nematodes in southern Queensland. DESIGN: An observational parasitological study using the faecal egg count reduction test. METHODS: Sheep farms (n = 20) enrolled in this study met the twin criteria of using...

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Bibliographic Details
Published in:Australian veterinary journal 2014-11, Vol.92 (11), p.415-420
Main Authors: Lyndal‐Murphy, M, Ehrlich, WK, Mayer, DG
Format: Article
Language:English
Subjects:
abamectin
Animal Husbandry
Animals
anthelmintic resistance
Anthelmintics - pharmacology
breeds
closantel
Drug Resistance, Microbial - drug effects
eggs
faecal egg count reduction test
farmers
Farms
fecal egg count
feces
gastrointestinal nematodes
Haemonchus contortus
larvae
levamisole
meat
moxidectin
Nematoda - drug effects
nematode control
Nematode Infections - drug therapy
Nematode Infections - veterinary
Parasite Egg Count - veterinary
Queensland
questionnaires
Sheep
Sheep Diseases - drug therapy
Surveys and Questionnaires
Trichostrongylus colubriformis
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Summary:OBJECTIVE: To establish the prevalence of anthelmintic resistance in ovine gastrointestinal nematodes in southern Queensland. DESIGN: An observational parasitological study using the faecal egg count reduction test. METHODS: Sheep farms (n = 20) enrolled in this study met the twin criteria of using worm testing for drench decisions and having concerns about anthelmintic efficacy. On each farm, 105 sheep were randomly allocated to one of six treatment groups or an untreated control group. Faecal samples were collected on day 0 and days 10–14 for worm egg counts and larval differentiation. Single‐ and multi‐combination anthelmintics, persistent and non‐persistent, oral liquid or capsule, pour‐on and injectable formulations were tested. Monepantel was not tested. Farmers also responded to a questionnaire on drenching practices. RESULTS: Haemonchus contortus was the predominant species. Efficacy
ISSN:0005-0423
1751-0813
DOI:10.1111/avj.12250