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Amylase, Procarboxypeptidase and Chymotrypsinogen in Pancreas of Chicks Fed Raw or Heated Soybean Diet

Department of Biological Chemistry, The Hebrew University of Jerusalem, Israel

Levels of amylase, procarboxypeptidase and chymotrypsinogen were measured in the pancreas of chicks fed diets containing heated or raw soybeans for several days after hatching. In chicks continuously fed raw soybeans, the levels of all three enzymes were lower by 50% or more than those in control chicks fed heated soybeans. This difference was apparent after only 1 day of feeding. In chicks fasted for 1 day after feeding raw soybeans for 4 days, levels of chymotrypsinogen and procarboxypeptidase were about twice those in control chicks, whereas amylase levels were the same as those of the controls. It is suggested that raw soybeans may have two different effects on the pancreas which are not directly related: 1) they increase the secretion of digestive enzymes in general, and 2) they specifically increase the synthesis of proteolytic enzymes.