A sheep's wool is the most widely used animal fiber, and is usually harvested by shearing. Many buyers avoid outlets known to be clearing houses for animals culled from healthy flocks as either sick or simply inferior. Most of these were derived from Merino sheep, and the breed continues to dominate the world sheep industry. Visual differences between sheep and goats include the beard of goats and divided upper lip of sheep. Bluetongue disease is an insect-borne illness causing fever and inflammation of the mucous membranes. Sheep tails also hang down, even when short or docked , while the short tails of goats are held upwards. Veterinary Immunology: An Introduction.
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