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Effect of Treating Soybean Meal with Formaldehyde on the Activity of Enzymic Inhibitors and on Protein Utilization in the Chick¹

Division of Animal Nutrition, Agricultural Research Organization, The Volcani Center, Rehovot, Israel

Abstract

The effect of treating raw soybean meal with formaldehyde (F) (1% of the meal protein content) on the trypsin and chymotryp-sin inhibiting activity was determined. Growth rate, feed arid protein utilization, pancreatic hypertrophy and enzymic activities in the -pan* creas and intestinal tract of growing chicks fed heated or raw soybean diets with or without F treatment were studied. The main effects of the F treatment were: 1) inactivating 99 and 97% of the trypsin and chymotrypsin inhibitory activities, respectively, of raw soybean meal; 2) reducing pancreatic hypertrophy; 3) restoring enzymic activities in the pancreas and intestine of chicks fed F-treated raw soybean diet (RSD) to that of heated soybean diet (HSD); 4) reduced growth rate, feed utilization and PER of both HSD and RSD groups; 5) increased fat content in abdominal adipose tissue and liver. The results are discussed in relation to the reaction of F with proteins.

¹ Contribution No. 122-E, 1975 Series, of the Agricultural Research Organization.

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