468 PRINCIPLES OF ANIMAL NUTRITION. 
utilization of the energy of the proteids used, with the exception 
of the strikingly higher result of the first period. 
A similar conclusion may be drawn from a study of the Méckern 
results as a whole, as recorded in Table VII of the Appendix. 
While the computed percentages in each series vary more or less 
in the different experiments, the differences are in most cases not 
large and appear to bear no relation either to the total quantity 
of food given or to the amount of the particular food under experi- 
ment which was added to the basal ration, but to be due rather 
to individual differences in the animals. This is strikingly shown 
in the following table, in which the results upon hay, wheat gluten, 
and starch are arranged in the order of the percentage utilization: 
Metaboliz- | Total Excess| Percentage 
able Energy | Over Com- | Utilization 
Feeding-stuff. Animal. Period. of Added | puted Main-| of Metabo- 
Food, tenance, lizable 
Cals. Cals. Energy. 
J 2 7875 12,192 34.8 
G 2 5726 9,780 36.2 
Meadow hay .......... F 1 5506 10,184 40.4 
H 7 8505 11,905 48.4 
H 2 7875 11,275 50.4 
(|; B 1 4483 15,129 36.9 
D 4 5713 17,373 37.3 
C 3 6033 19,635 43.2 
Wheat gluten......... 4| IIT 3 2913 8,982 45.3 
II 4 5332 11,401 48.0 
B 3 5507 16,153 49.7 
L| IV 3 3645 7,132 58.2 
(| VI 3 8264 12,364 46.6 
a a 5038 9,138 48.1 
; 4350 3,411 49.2 
Starch—Kthn's expts.. 4 ut} 2 4998 6.592 50.0 
Vv 2a 5425 8,821 53.2 
[| V 3 9658 13,054 59.7 
(| D 2 4420 16,080 53.7 
J 3 4826 9,142 54.8 
H 3 6668 10,068 56.0 
Starch—Kellner’s expts {| C 2 3027 16,829 57.6 
F 4 5009 9,686 64.8 
B 2 3291 13,937 65.4 
G | 4 5387 91441 65.8 
But while this is true of each series by itself, a comparison of 
the two series upon starch leads to a different conclusion. In 
Kithn’s experiments the basal rations consisted largely or exclu- 
sively of coarse fodder. In Kellner’s experiments the starch was 
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