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The Influence of the Method of Oil Extraction on the Feeding Value of Soybean Oilmeals

Ohio Agricultural Experiment Station

Abstract

Early experiments showed a wide range in the worth of soybean oilmeals for supplementing corn in the feeding of pigs. Some samples proved highly efficient while others gave very disappointing results. These varying results and the use of different processes in the manufacture of soybean oilmeal led to the decision to make a direct comparison of meals manufactured by different methods.

Extraction Methods

In the production of solvent or new-process soybean oilmeal the oil is removed by some chemical such as benzol. According to the description given, the solvent meal used was prepared by flaking the beans through a set of rolls, then passing them through a vat containing superheated steam. Following this the benzol was kept under pressure for some time and finally drawn off when the solution applied was entirely completed, after which the meal was taken out and received no further treatment.

Hydraulic or old-process soybean oilmeal is manufactured in the same manner as old-process linseed meal.