Hairy shaker disease is caused by a pestiviral infection of the ewe during pregnancy. It can result in early abortion, or the surviving lamb being undersized with an excessively hairy fleece. Some lambs have involuntary tremors and most are unlikely to live for long.
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Reference: D. M. West, A. N. Bruere and A. L. Ridler, The sheep: health, disease & production. Palmerston North: Veterinary Continuing Education, Massey University, 2002, fig.
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