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Tapeworm (Moniezia expansa) and its effect on sheep production: the evidence reviewed
1Wallaceville Animal Research Centre, Research Division, Ministry of Agriculture and Fisheries, Private Bag, Upper Hutt.
Abstract:
Literature relating to the effects of the tapeworm Moniezia expansa on sheep is reviewed. While there are many claims of adverse effects by this organism, none of these withstand critical scrutiny. The balance of evidence indicates that M. expansa infections are generally harmless, even when the tapeworms are present in large numbers in young lambs, and that there is no justification for treating sheep for M. expansa on the basis of any likely benefit to the health or production of the animals. No published experimental results can be found to support claims that heavy M. expansa infections sometimes exacerbate losses from other causes. Anthelmintics for investigative use, and some aspects of the classification, life history and biology of M. expansa and of its intermediate host are also discussed.
Insights
The tapeworm Moniezia expansa generally causes no harm to sheep, even in large numbers. Current evidence does not support treating sheep for M. expansa infections due to a lack of proven health or production benefits.
Area of Science:
- Veterinary Parasitology
- Sheep Health Management
Background:
- Moniezia expansa is a tapeworm commonly found in sheep.
- Numerous claims exist regarding its adverse effects on sheep health and productivity.
Purpose of the Study:
- To critically review the scientific literature on the effects of Moniezia expansa in sheep.
- To evaluate the justification for treating sheep against M. expansa infections.
Main Methods:
- Comprehensive literature review of existing studies on Moniezia expansa.
- Critical analysis of reported adverse effects and treatment efficacy.
Main Results:
- Most claims of adverse effects from Moniezia expansa lack critical scientific support.
- Evidence suggests M. expansa infections are generally harmless to sheep, including lambs, regardless of worm burden.
- No published experimental data supports claims that M. expansa exacerbates losses from other causes.
Conclusions:
- There is no scientific basis for treating sheep for Moniezia expansa based on potential health or production benefits.
- The economic impact and necessity of anthelmintic treatment for M. expansa require re-evaluation.
