In the absence of a better way of defining a problem or disease, the symptoms were often used. A lamb with a hairier than normal coat and continuous tremors is described as having 'hairy shaker' disease.
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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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