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The Growth-Promoting Factors in Dried Corn Distillers Solubles and Possible Interrelationships between Solubles and Certain Minerals¹

University of Kentucky, Lexington

Abstract

In three experiments, 132 pigs were used to study the occurrence of parakeratosis in pigs fed varying levels of calcium and to determine the value of distillers solubles and zinc as a preventive or cure of the disease.

The feeding of semi-purified rations containing levels of calcium up to 1.3% to pigs confined to metal wire-floored crates produced good rates of gain and feed conversion with no symptoms of parakeratosis. The feeding of a corn-soybean meal ration with the calcium level at 0.50% resulted in good growth; with the calcium level raised to 1.36% it resulted in poor growth and 50% parakeratosis. The animals exhibited symptoms as described by Kernkamp and Ferrin (1953).

The addition of 5% distillers solubles to the 1.34% calcium ration did not improve growth, and 40% of the pigs developed parakeratosis. Adding zinc at a level of 26.7 ppm prevented parakeratosis and improved growth.

Distillers solubles improved growth rate of pigs on low-calcium and high-calcium rations supplemented with zinc. Where symptoms of parakeratosis were present, zinc supplementation resulted in increased growth rate and alleviation of symptoms.

¹ The investigation reported in this paper is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.

² This material is based upon part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at the University of Kentucky.