University of Maryland Extension Small Ruminant Program Facebook Page
Shepherd's Notebook Blog
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External (ecto) parasites

External parasites are organisms that live on or within the skin of their host or lay eggs in their nasal passages. They include lice, ticks, mites, and flies. Winter is usually the season when external parsites are most problematic, as animals are often held in close confinement; thus, the parasites can easily be spread from one animal to another. On this page, links are listed alphabetically according to pest or topic: blow flies (fly strike), control and management, general information, fleas, lice, mites, nose bots, screwworms, and ticks.

Click on the title bars to open and close the drop down lists. Use the menu on the left to find links on specific topics.

All of the links on this page were last verified 07-Sept-2013. Please report broken links to Susan Schoenian at

Large flock in Spain
Sheep grazing in Spain