THE UTILIZATION OF ENERGY. 491 
PERCENTAGE UTILIZATION OF METABOLIZABLE ENERGY. 
Utilisat A 
111zation 
as Computed Utlzation. 
by Kellner. 
By RUMINANTS. 
Concentrated Feeding-stuffs : 
Starch, Ktihn’s experiments .............. 49.0 50.0 
ee Kellner’ 8 expts., moderate rations . 58.9 58.4 
“ «heavy rations.. 58.9 61.5 
Oil, Sample Il, OxXG.................0.. 59.4 69.4 
Wheat gluten, Kellner’s experiments....... 45 .2* 40.3 
Conglutin, Kern .................-.0.00. 67.7* 
Flesh-meal, Kern..............0 00s eee eee 65.0* 
Coarse Fodders : 
Meadow ‘hay... wcccccne ds gute pce es Sa ha soos 41.5 41.4 
OGt StPAW 2.5 0 cdse lis aecnap ime asses ee BW cea 37.6 36.1 
Wheat straw eas 's cae ngene desea as ete oes 17.8 17.4 
Extracted straw ........... 0c cece cee eee 63.1 63.0 
By Swine. 
RicOs ca ecsadien Gaeta Mises Sees 78.0 
Barley 70.9 
Mixed grain 68.5 
* Of protein. 
The Expenditure of Energy in Digestion, Assimilation, and 
Tissue Building.—As was shown in the introductory paragraphs on 
‘ p. 466, the recorded data do not permit us to distinguish between the 
energy expended in the digestion, resorption, and assimilation of 
the various feeding-stuffs experimented upon and the energy which 
we have reason to believe is required for the conversion of the assim- 
ilated material into tissue. Accordingly these two factors have 
been grouped together in the foregoing summaries of results. Some 
interesting facts are revealed, however, by a comparison of the 
total expenditure of energy for these two purposes in the several 
cases. Kellner’s results, as the latest and apparently most accurate 
and representative, have been made the chief basis of the compari- 
son, the figures being those computed by the writer and therefore 
showing the aggregate net effect upon the balance of energy, that is, 
the “apparent” utilization. 
Coarse Fopprers.—A comparison of the coarse fodders with 
each other brings out the interesting fact that while the percentage 
of the gross energy recovered in the gain varied from 5.5 to 47.6, 
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