992 
Journal of Agricultural Research 
Vol. XXXI, No. 10 
the observed and the computed heat production is made in Table 
V and shows the measurement of the heat production to have been 
satisfactory. 
CORRECTION OF OBSERVED HEAT PRODUCTION 
Preparatory to use in the computation of the net energy of a feed 
it is necessary to apply a correction of the observed heat production to 
compensate for inequality of time spent by the animal in the standing 
and the lying positions, a standard day of 12 hours standing and 
12 hours lying having been arbitrarily adopted as a feature of the 
experimental routine. 
This correction was made in accord with the recently published 
method of Fries and Kriss, 4 the details of which will not be repeated 
here. The method of this correction and the corrected data are as 
indicated in Table VI. 
Table VI. — Observed heat production corrected to 12 hours standing and 12 hours 
lying 
Period 
Observed 
daily 
heat 
produc¬ 
tion 
Hours 
standing 
Differ¬ 
ence 
from 12 
hours 
Live 
weight 
Hourly 
correc¬ 
tion for 
position 
Correc¬ 
tion to 
standard 
day 
Corrected 
heat 
produc¬ 
tion 
I.. 
Calories 
11,088.6 
9,723.3 
7,303.7 
10 ,886.0 
9,697.6 
6 ,795.0 
10.13 
1.87 
Kilograms 
348.6 
Calories 
24.1 
Calories 
45.1 
Calories 
11,133.6 
9,842.6 
7.393.8 
10,946.3 
9,766.5 
6.867.8 
Ill_ 
7.05 
4.95 
353.7 
24.1 
119.3 
V__ 
8.26 
3.74 
337.1 
24.1 
90.1 
II__ 
9.50 
2.50 
348.7 
24.1 
60.3 
IV__ 
9.14 
2.86 
349.4 
24.1 
68.9 
VI____ 
8.98 
3.02 
329.4 
24.1 
72.8 
METABOLIZABLE ENERGY, HEAT PRODUCTION, AND ENERGY 
GAIN 
In Table VTI it is seen that the metabolizable energy varies, in 
general consistently with the total dry matter, but that as related 
to the kilograms of dry matter the metabolizable energy of the hay 
is slightly higher than that of the meal, in harmony with the 
previously noted difference in digestibility; and that the metabolizable 
energy on the two higher planes of feed intake, with both feeds, is 
significantly lower than on the lowest plane of intake. On the two 
higher planes of intake the metabolizable energy per kilogram of 
dry matter of both hay and meal agrees very well. 
Table VII. — Dry matter, metabolizable energy, heat production , and energy gain 
Feeding stuff and period No. 
Dry matter 
eaten 
Metabo¬ 
lizable 
energy, 
total 
Metabo¬ 
lizable 
energy per 
kilogram 
dry matter 
Heat pro¬ 
duction 
corrected to 
standard 
day 
Gain of 
energy 
Alfalfa hay: 
Kilograms 
Calories 
Calories 
Calories 
Calories 
Period I_ 
6.638 
13,337 
2,009 
11,134 
+2,203 
Period III... 
5.320 
10,650 
6,510 
2,002 
9,843 
+807 
Period V__ 
Alfalfa meal: 
3.052 
2,133 
7,394 
-884 
Period II__- 
6.671 
13,238 
1,985 
10,946 
+2,292 
+894 
Period IV-- 
5.408 
10,661 
6,587 
1,971 
9,767 
Period VI___ 
3.155 
2,088 
6,868 
-281 
* Fries, J. A., and Kriss, M. metabolism of cattle during standing and lying. Amer. Jour 
Physiol. 71: 60-83. 1924. 
