28 
BULLETIN" 470, U. S. DEPAKTMENT OF AGRICULTURE. 
Data of digestion experiments with kaoliang mush in a simple mixed diet — Continued. 
Weight. 
Water. 
Protein. 
Fat. 
Carbohy- 
drates. 
Ash. 
Experiment No. 400, subject 0. E. S.: 
Kaoliang mush 
Grams. 
2, 146. 
742.0 
198.0 
1, 036. 
192.0 
Grams. 
1,543.4 
676.2 
21.8 
414.4 
Grams. 
83.2 
1.7 
2.0 
Grams. 
20.0 
2.2 
168.3 
Grams. 
477.1 
60.6 
Grams. 
22.3 
1.3 
5.9 
621.6 
192.0 
4,314.0 
154.0 
2,655.8 
86.9 
78.2 
8.7 
190.5 
26.1 
164.4 
1,351.3 
35.4 
1,315.9 
29.5 
14.3 
15.2 
Digestibility of entire ration (per cent) . 
10.0 
86.3 
97.4 
51.5 
Estimated digestibility of mush alone 
6.5 
29.3 
97.4 
399.1 
Average food consumed per subject 
1, 542. 
1, 032. 2 
71.3 
10.1 
Summary of digestion experiments with kaoliang mush in a simple mixed diet. 
Experi- 
ment No. 
Subject. 
Protein. 
Carbohy- 
drates. 
Experi- 
ment No. 
Subject. 
Protein. 
Carbohy- 
drates. 
385 
386 
387 
388 
397 
D.G.G 
A. J.H 
R.L.S 
O.E.S 
D.G.G 
Pit cent. 
Per cent. 
96.9 
96.0 
95.6 
96.1 
95.7 
398 
399 
400 
A. J.H 
R.L.S 
O.E.S 
Per cent. 
7.3 
21.4 
6.5 
Per cent. 
95.3 
96.7 
97.4 
Average 
4.4 
96.2 
The digestibility of the kaoliang protein was found by averaging 
the eight experiments to be only 4.4 per cent, although the carbo- 
hydrate from this source was 96.2 per cent digested; 28 grams of 
protein and 168 grams of carbohydrate per man per day were sup- 
plied by the kaoliang mush. As the subjects reported that they 
were in normal physical condition during these experiments, it seems 
reasonable to attribute the incomplete digestibility of the kaoliang 
protein to the structure of the grain rather than to the chemical 
nature of the protein molecule. In view of the lack of information, 
however, regarding the histology of kaoliang and the other grain 
sorghums, it is difficult at the present time to explain conclusively 
the differences found for the digestibility of the protein constituent 
of these cereals. 
SUMMARY OF DATA ON THE DIGESTIBILITY OF THE GRAIN-SORGHUM MUSHES. 
The results of the experiments with the sorghum mushes show that 
48 per cent, 48 per cent, 34 per cent, and 4 per cent of the cereal 
protein furnished by the rations containing dwarf kafir, feterita, 
dwarf milo, and kaoliang, respectively, are the estimated values for the 
digestibility of the protein constituent of the grains. Since these 
values were determined by as direct a method as is available — 98 to 
99 per cent of the total protein of the diet was obtained from the 
