298 PRINCIPLES OF ANIMAL NUTRITION. 
most important single factor in determining its content of metabo- 
lizable energy. We may eliminate this factor by computing, on 
the basis of the determinations of digestibility, the energy of the 
digested organic matter and the proportion of this energy which 
was lost in urine and methane or was metabolizable. In this way 
we may secure figures which will be useful as a basis for estimat- 
ing the energy values of rations in experiments in which it has 
not been determined, and which will also afford, from some points 
of view, a better idea of the relative extent of the losses other than 
those in the feces. 
Coarse Fopprers ALonE.—In the cases in which coarse fodder 
constituted the exclusive ration the computation from the data 
giyen on p. 286 and. the amounts of organic matter apparently 
digested in the several experiments is very simple and yields the 
following results per gram digested organic matter: 
Loss in sacs 
Ani- Feed Gross 
mal. . Energy. 
Urine, |Methane. Pp Per 
Per Per Cent Grm.. 
‘ Cent Cent. me. | Cals. 
A | Meadow hay I............ 4.509 9.75 | 10.35 | 79.90 | 3.603 
II _ BBS As. cscigeteabesansne ee 4.408 8.98 | 14.62 | 76.40 | 3.368 
Vv ue Bsns sigs ook ais 4.317 8.25 | 12.00 | 79.75 | 3.443 
VI ee (OID yoga meae 4.398 8.65 | 12.35 | 79.00 | 3.474 
xX By SGM Nadiceat atennchana 4.452 | 13.85 | 11.36 | 74.79 | 3.330 
I SE OL Sea Sepeaiaetas 4.371 9.59 | 11.99 | 78.51 | 3.432 
Average... ....c0cse0: 4.409 | 9.85 | 12.09 | 78.06 | 3.442 
Average for timothy hay .| 4.377 4.95 | 12.33 | 82.72 | 3.620 
Coarse Fopprers Appep To BasaL Ration.—From the re- 
sults contained in Table I of the Appendix we may compute in sub- 
stantially the same manner the total and metabolizable energy of 
the digestible organic matter of the coarse fodders which were 
added to the basal rations. In the table referred to, a correction 
was introduced for the small differences in the amount of the basal 
rations consumed in the periods compared. In the present com- 
putations it has been assumed that the organic matter of these 
small differences possessed the same digestibility as the total organic 
matter of the basal ration. For example, in the case of Ox H, 
