Iodine deficiency or goitre characteristically causes a swelling of the thyroid gland in the neck. It could have been prevented by adding iodine to the diet of the pregnant ewe.
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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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