474 PRINCIPLES OF ANIMAL NUTRITION. 
PERCENTAGE DISTRIBUTION OF GROSS ENERGY OF STARCH, 
Work of 
Diges 
¢ An 
& perce Ieee | 
2 hy baat eines lation, | Gain 
a] 3 ; 
g me) s Tissue 
§ 5 a Build- 
Ay ai ing, 
(| IIT] 2 | 20.02] —1.29) 10.06; 35.61] 35.60 
| IV | 2 | 25.29} —1.01] 12.01] 32.41 ae 
ee A Vi 2a} 8.82 1.03] 11.20] 36.95} 42. 
Kuhn's experiments...... vl 25 |15.73| —0.27| 9 86| 34.58] 40.10 
VI | 20 | 22.49| —2.61] 8.86) 36.96; 34.30 
VI} 3 | 19.03} —0.88} 11.87] 37.38] 32.60 
{| D| 2 |29.99) —3.27] 6.08] 31.10! 36.10 
Kellner’s experiments: | F/ 4 |16.42) 0.73] 11.41) 25.24) 46.20 
Moderate rations....... G| 4 |13.35} 0.35] 8.98) 26.42) 50.90 
|| H]| 3 |15.72| —2.32| 7.38] 34.82] 44.40 
; L] J] 3 |14.85} 1.14, 11.85] 32.66] 39.50 
Kellner’s experiments: ‘x6 
. B} 2 |59.60} —3.25|—4.96) 16.82) 31. 
EIcang) BARONS sais 1) G3 | 82:92] ~0:80|—0-or1 28.68 | 28.00 
Averages: 
Kiihn’s experiments ..... ....{....-| 19.59] —0.92| 10.74] 35.19} 35.40 
Kellner’s experiments: : . 
Moderate rations....... ..../....{ 17.61] —0.66]| 9.21) 30.64] 43.20 
Heavy rations......... .eee[e.-.| 55.91] —2.07|—2.49] 18.75 | 29.90 
negative losses in the urine and, in two cases, in the methane 
mean, of course, that under the influence of starch the metabolic 
or other processes were so modified that less of the potential energy 
of the basal ration was lost through these channels. The starch, 
so to speak, borrowed energy from the basal ration. In brief, the 
figures of the table give us a picture of the aggregate net results of 
supplying 100 units of additional potential energy in the form of 
starch, or in other words, of the “apparent” utilization. 
As between Kiithn’s results and those of Kellner upon moderate 
rations, the chief difference, as already noted, is the less evolution 
of methane in the latter and, apparently as, in part, a consequence 
of this, the smaller expenditure of energy in the work of digestion, 
etc. Combined with the slightly smaller loss in the feces, this 
results in making the energy utilized a much larger percentage of 
the gross energy. Apparently Kellner’s figures correspond most 
nearly to normal conditions of feeding and may be taken to repre- 
sent the average utilization of starch under these circumstances. 
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