DIGESTIBILITY OF MISCELLANEOUS ANIMAL FATS. 
Data of digestion experiments with goaf 's-milk butter in a simple mixed 
diet — Continued. 
Weight 
of foods. 
Constituents of foods. 
Experiments, subjects, and diet. 
Water. 
Protein. 
Fat. 
Carbohy- 
drate. 
Ash. 
Experiment No. 648, subject A. A. R. : 
Blancmange containing goat's milk butter. 
Grams. 
1,770.0 
192.0 
1,059.0 
210.0 
Grams. 
998.3 
17.3 
920.3 
Grams. 
46.4 
20.3 
8.5 
Grams. 
122.3 
2.9 
2.1 
Grams. 
593.1 
148.4 
122.8 
210.0 
Grams. 
9.9 
3.1 
Fruit 
5.3 
3,231.0 
71.0 
1,935.9 
75.2 
25.0 
50.2 
127.3 
6.6 
120.7 
1,074.3 
33.0 
1,041.3 
18.3 
6.4 
11.9 
66.8 
94.8 
96.9 
65.0 
Average food consumed per subject per day . . . 
995.3 
558.1 
27.0 
44.6 
359.7 
6.0 
Summary of digestion experiments with goafs-milk butter in a simple mixed 
diet. 
Experiment No. 
Subject. 
Digestibility of entire ration. 
Esti- 
mated 
Protein. 
Fat. 
Carbohy- 
drate. 
Ash. 
digesti- 
bility of 
goat's 
milk but- 
ter alone. 
645 
A. F 
Per cent. 
71.6 
76.9 
72.4 
66.8 
Per cent. 
92.4 
93.8 
93.3 
94.8 
Per cent. 
97.2 
98.1 
96.9 
96.9 
Per cent. 
59.4 
71.7 
64.5 
65.0 
Per cent. 
97.4 
646 
P. K 
97.5 
647 
J. C. M 
98.6 
648 
A. A. R 
100.0 
Average 
71.9 
93.6 
97.3 
65.2 
98.4 
Considering the diet as a whole, the subjects ate on an average 
27 grams of protein, 45 grams of fat, and 360 grams of carbohydrate 
daily, which supplied approximately 2,079 calories of energy. Since 
the available amount of goat's butter was small, only about 45 grams 
of fat, of which about 43 grams was goat's butter, was eaten daily. 
The digestibility was found to be 71.9 per cent for protein, 93.6 
per cent for fat, and 97.3 per cent for the carbohydrate supplied by 
the diet as a whole. When correction is made for the metabolic 
products and undigested basal-ration fat which occurs in the ether 
extract of the feces, the figure 93.6 per cent for the digestibility of 
the total fat of the diet becomes 98.4 per cent for the digestibility of 
goat's butter alone. 
For the sake of comparison it is of interest in this connection to 
refer to the figure for the digestibility of cow's butter 1 determined 
under conditions identical with those maintained for the experiments 
here reported. This was found to be 97 per cent, a difference, which 
for all practical dietetic purposes is negligible as compared with 99 
*U. S. Dept. Agr. Bui. 310 (1915), p. 
21. 
