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Soybean Oil Meal and Other Plant Protein Rations for Pigs, Supplemented with Limestone and Bone Meal

University of Wisconsin

Abstract

Grain rations that are balanced with soybean oil meal and used for pigs, have interested nutrition workers for a number of years. Some very interesting results have been secured at more than one experiment station, particularly at Ohio, where the question of favorable levels of calcium and phosphorus has been under scrutiny.

It seemed desirable to extend this inquiry to find out whether with practical rations and under conditions of abundant sunlight in dry lots and on pasture, and of usually limited sunlight in winter, pigs might indicate varying optimum levels and proportions of calcium and phosphorus in their rations. This investigation was also made to include grain rations that were balanced with the combination of linseed meal and wheat middlings, which are richer in phosphorus than is soybean oil meal.

The very practical question was also asked in this experimental set-up whether pigs fed strictly grain or cereal rations, where home-grown grain was supplemented with soybean oil meal or with linseed meal and wheat middlings, would consume enough ground limestone, which gave the lowest Ca:P of ratio of the lot, access to these minerals in separate mineral boxes.