2092 PRINCIPLES OF ANIMAL NUTRITION. 
Moreover, the loss of energy in the feces is a complex of sev- 
eral factors. The amounts of organic matter and of the several 
nutrients excreted in the feces in the two periods (not corrected for 
the 70 grams difference in organic matter consumed) were as 
follows: 
Organic | protein, | Crude Pubaoeens Crude 
ates | erat’ | SE | alee | et 
Grms 
Period Geass paved daves3awe 2132 403 595 1068 66 
BOO BA cases due tine eee ee ad 1797 284 ~ 527 924 62 
Difference............... 335 119 68 144 | 4 
In addition to protein and nitrogen-free extract, which may 
possibly represent indigestible material in the molasses, the feces 
contained 68 grams more crude fiber and 4 grams more fat in Period 
6 than in Period 3. These cannot have been derived from the 
molasses, since the latter does not contain these ingredients. This 
feeding-stuff, in other words, diminished the apparent digestibility 
of the fiber and fat of the basal ration. As a matter of fact, the 
ingredients of molasses being practically all soluble in water, it is 
probable that nearly all the difference in the amount digested is 
due to the diminished apparent digestibility of the basal ration 
under the influence of the molasses. 
The figure above given for the metabolizable energy includes all 
these effects; that is, it shows the net result as regards energy ob- 
tained from molasses fed under the conditions of these experiments, 
the Hutritive ratio of the basal ration being 1: 5.8 and that of the 
molasses ration 1:6.4. To get at the actual amount of energy set 
free from the molasses itself we should need to subtract from the 
metabolizable energy as calculated above the energy corresponding 
to the decreased excretion of methane and to add to it the metabo- 
lizable energy corresponding to the decrease in the amounts of crude 
fiber and ether extract digested, assuming that all the excess of 
protein and nitrogen-free extract in the feces was derived from the 
molasses. Computed in this way * the real metabolizable energy 
* One gram of crude fiber = 3.3 Cals., and one gram of ether extract = 
8.3 Cals. See p. 332. 
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