May, 1918] 



Digestibility of Soy Bean Meal 



283 



rection for metabolic products in the feces. We feel safe in 

 concluding, however, that soy bean meal prepared as in this 

 experiment is as digestible as regards its protein as is the protein 

 of fine wheat flour which stands supreme among the cereal 

 grains in this respect. 



The carbohydrates of bread made from fine wheat flour are 

 97.7 per cent absorbed in man," milk sugar 99^'^ per cent and 

 cane sugar probably 100 per cent. Using these values the 

 nitrogen-free extract of the soy bean meal is found to have a 

 coefficient of digestibility of 96.9 per cent. 



EXPERIMENT II. 



In this experiment the soy bean meal was prepared as a 



porridge by cooking five hours in a double boiler. This sample 



of meal contained more grit than that used in Experiment I, 



but not enough to increase the ash content greatly. It had 



the following composition: 



Percent 



Moisture 4.17 



Ash 5.80 



Protein 49.31 



Crude fiber 5 . 10 



Fat 6.50 



N-free extract 29. 12 



The diet for the three-day period contained the following, 

 approximately one-third being eaten each day: 



Grams 



Protein 

 Grams 



Milk 



Butter 



Cane sugar. . . . 

 vSoy bean meal. 



Total 



Per Day. . 



2000 

 150 

 300 

 370 



70 



182 



2750 

 917 



252 

 84 



Fat 

 Grams 



N-free 

 Extract 

 Grams 



80. 

 127.5 



24'0 



94 



300 

 108 



231.5 



77.2 



502 

 167 



Calories 



1376 

 1147 

 1200 

 1375 



5098 

 1699 



The fecal residue from this food weighed 224 grams moist 

 and 58.1 grams air dry and contained: 



Percent Grams 



Moisture 4.40 2 56 



Ash 20.64 11.19 



Protein 39.90 23.20 



Crude fiber 7.00 4.06 



Fat 18.96 11.00 



N-free extract 9.00 5.22 



