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(473) This is seen in pigs from 5-16 weeks of age associated with a deficiency of zinc and/or an excess of calcium which suppresses the availability of zinc in the diet. Up to 50% of pigs may be affected. The major signs are limited to the skin where gross thickening and roughening occurs over the complete body. It may start initially with small light brown spots or papules on the legs and abdomen and in young pigs it can look like greasy pig disease. Treatment and control involve analysing the levels of calcium in the diet (normal 0.6 and 0.7%). Zinc oxide or sulphate can be added to the ration at a level of 50ppm to prevent the disease. The condition is now uncommon.

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