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Risk of Intestinal worms

Pasture infestation occurs when eggs, larvae or immature worms are passed from an infected horse’s manure into the environment. When the eggs or larvae are accidently ingested, the horse is re-infected.2

In the case of tapeworm, eggs are passed in the manure and eaten by forage mites, with the immature worm developing within the mite.

When a horse accidently ingests the mite while grazing, the mite releases the tapeworm into the horse’s gut, beginning the cycle all over again.3

If there are many horses in a given area, the risk of environmental contamination from dung, and therefore worm infestation, will be increased.2


  1. Queensland Government Department of Agriculture, Fisheries and Forestry. Worms in horses, January 2012.
  2. Robinson S. Worm control in horses. PrimeFact 976, February 2010. NSW Government Department of Industry and Investment.
  3. American Association of Equine Practitioners. Tapeworms. April 2012.