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Mineral Interrelationships in Parakeratosis of Swine¹

Michigan State University

Abstract

In an experiment involving 4 lots of 10 pigs each, 100% incidence of parakeratosis was produced by feeding a ration containing 1.50% calcium, 0.80% phosphorus and 31 p.p.m. zinc. When the same ration was supplemented with 20 p.p.m. of zinc (as zinc carbonate) only one animal of the group developed mild symptoms of the disease.

Parakeratosis was produced in three of ten pigs by feeding a ration containing 0.98% calcium, 0.70% phosphorus and 29 p.p.m. zinc. Parakeratosis was completely prevented in 10 pigs by the supplementation of this latter ration with 20 p.p.m. of zinc.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1831.

² Departments of Agricultural Chemistry, Animal Husbandry and Animal Pathology, East Lansing.

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