A comparative study of the nutritional and physiological significance of raw and heated soya beans in chicks and goslings.

1. The comparative effects of raw soya beans on food intake, growth, digestive organ weight, and enzyme activities in goslings and chicks were studied, 2. Goslings were more affected than chicks by the ingestion of a raw soya-bean diet (RSD) in the following ways: reduction in food intake and growth rate; increase in relative weight of the digestive organs; reduction in specific activities of lipase (EC3.1.1.3), amylase (EC3,2.1.1) and chymotrypsin (EC3.4.4.5) in the pancreas (not affected in chicks); greater inhibition of trypsin (EC 3.4.4.5) in the pancreas (not affectd in chicks); greater inhibition of trypsin (EC3.4.4.4.), chymotrypsin and amylase in the inteatinal contents of goslings than of chicks. 3. Addition of methionine to the RSD improved food intake and growth rate more in goslings than in chiks. 4. The interrelationships between enzyme activities, food passage rate, nutrient absorption and food intake regulation are discussed.