Sheep with advanced Johne’s disease typically look unhealthy and thin. It is spread when animals ingest contaminated faecal matter on pasture or in drinking water.
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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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