386 
Journal of Agricultural Research 
Vol. VII, No. 9 
Table XI .—Increment of heat production per kilogram of dry matter 
Total 
incre¬ 
ment. 
Analysis of heat increment. 
Feeding and period No. 
Standing 
12 hours. 
Rising 
and lying 
down. 
Methane 
fermen¬ 
tation. 
Remain¬ 
der. 
Clover hay: 
Cal. 
Cal. 
Cal. 
Cal. 
Cal. 
I-II. 
9 S 4 
148 
-19 
US 
M 
O 
Maize meal: 
III-II. 
1, 2 53 
196 
-18 
190 
885 
IV-II. 
i » 2 35 
1,382 
192 
“ 3 
154 
892 
V-II. 
197 
“ 3 1 
230 
986 
IV-III. 
I, 208 
186 
+ 19 
IOI 
902 
III-V. 
990 
194 
+ 8 
I09 
679 
IV-V. 
T 37 
189 
+15 
104 
829 
Average of all. 
1,201 
192 
— 2 
148 
862 
Average, omitting Periods III-II 
and II-V. 
143 
190 
10 
117 
826 
The total energy expenditure per kilogram of dry matter of the clover 
hay, 954 Calories, agrees well with the value 992 Calories previously 
obtained for clover hay in experiment 179, and indicates that the very 
low value of 453 Calories obtained in experiment 186 was, as was sus¬ 
pected, erroneous. 1 It would appear that the mean of the two, 973 
Calories, may be taken as the average value for red-clover hay, particu¬ 
larly as it is only slightly higher than that of 932 Calories computed from 
one of Kellner s experiments. 2 
The average figure for the total increment per kilogram of dry matter 
of maize meal eaten is 1,201 Calories, somewhat lower than the value of 
1,434 Calories previously published. Another earlier experiment gave a 
value of 952 calories; but this was discarded, since the increment during 
lying (the “remainder” of Table XI) was only 393 Calories, as compared 
with 906 Calories in the experiment reported and 863 Calories, the aver¬ 
age obtained in the present series. 
Of the comparisons tabulated, however, Periods III—II and Periods 
II-V, are based on comparatively small differences in total heat produc¬ 
tion, so that the deduction for the energy expenditure due to the hay 
enters as a relatively large factor. If these two comparisons are omitted, 
the average of the remaining four is 1,143 Calories, which agrees closely 
with that of 1,137 Calories obtained from a comparison of the lightest and 
heaviest mixed rations (Periods IV-V), so that we are inclined to attach 
greater weight to this figure. The mean of this and the earlier experi¬ 
ment is 1,289 Calories, which may be taken as the corrected value for 
the heat production caused by the consumption of 1 kgm. of dry matter 
of maize rneafby cattle. 
1 Armsby, H. P., and Fries, J. A. Op. cit., 1915, p. 473, 482. 
2 Idem., p. 478. 
