DIGESTIBILITY OF MISCELLANEOUS ANIMAL FATS. 21 
Data of digestion experiments with ox-tail fat in a simple mixed diet — Contd. 
Weight 
of foods. 
Constituents of foods. 
Experiments, subjects, and diet. 
Water. 
Protein. 
Fat. 
Carboh y- 
drate. 
Ash. 
Experiment No. 706, subject A. A. R.: 
Grams. 
1,537.0 
244.0 
1,192.0 
118.0 
Grams. 
698.4 
21.9 
1,035.8 
Grams. 
30.5 
25.9 
9.5 
Grams. 
192.4 
3.7 
2.4 
Grams. 
603.1 
188.6 
138.3 
118.0 
Grams. 
12.6 
3.9 
Fruit 
6.0 
3,091.0 
115.0 
1, 756. 1 
65.9 
14.7 
51.2 
198.5 
20.2 
178.3 
1,048.0 
69.4 
978.6 
22.5 
10.7 
11.8 
Per cent utilized 
77.7 
89.8 
93.4 
52.4 
Average food consumed per subject per day. .. 
1,042.1 
527.2 
25.2 
76.6 
405.1 
8.0 
Summary of digestion experiments with ox-tail fat in a simple mixed diet. 
Subject. 
Digestibility of entire ration. 
Esti- 
mated 
Experiment No. 
Protein. 
Fat. 
Carbohy- 
drate. 
Ash. 
digesti- 
bility of 
ox-tail 
fat alone. 
704 
p. K 
Per cent. 
75.4 
70.7 
77.7 
Per cent. 
94.1 
95.0 
89. 
Per cent. 
98.3 
97.2 
93.4 
Per cent. 
75.5 
67.3 
52.4 
Per cent. 
96.3 
705 ... 
706 
J. CM 
A. A. R 
98.2 
95.4 
Average 
74.6 
93.0 
96.3 
65.1 
96.6 
The daily diet supplied on an average 25.2 grams protein, 76.6 
grams fat, and 405.1 grams carbohydrate, the energy value being 
2,411 calories. 
The average digestibility of the diet as a whole was found to be 
74.6 per cent for protein, 93 per cent for fat, and 96.3 per cent 
for carbohydrate when 25 grams of protein, 77 grams of fat, and 
405 grams of carbohydrate were eaten daily. The estimated digesti- 
bility of ox-tail fat alone was found to be 96.6 per cent when the 
usual correction was made for the metabolic products and undigested 
basal-ration fat occurring in the ether extract of the feces. 
In reports of their physical condition during the test period, the 
subjects made no reference to any laxative effect resulting from the 
diet, and accordingly it is assumed that the limit of tolerance for 
ox-tail fat is in excess of 84 grams daily, the amount eaten by one 
of the subjects, J. C. M., for the three-day test period. 
In so far as these experiments are concerned, it would appear that 
ox-tail fat, which is quite completely digested and does not produce 
physiological disturbances when eaten in normal amounts, should 
