1068 
Journal of Agricultural Research 
Vol. XXXI, No. 11 
being in close agreement. That the effect of the refused feed is so 
marked in this particular instance is no doubt due to the fact that the 
cow went badly off feed just prior to the respiration-calorimeter test. 
Table XIII sets forth a correction to be applied to the dry matter 
of the excreta on account of irregularity of excretion. This is neces¬ 
sary because the balances of nitrogen and carbon are computed on 
the basis of the 10-day period, the correction rendering the outgo 
during the calorimeter days representative of the digestion period as 
a whole. 
Table XIII.— Correction for irregularity of excretion 
Experiment, animal, and period Nos. 
Dry matter of the dung 
and urine mixture 
(per day) 
Correction 
10-day 
period ° 
Calorime¬ 
ter day « 
221D-885-I...... —... 
Grams 
1,349.1 
Grams 
955.3 
Grams 
+393.8 
II _______ 
1,982.9 
1,355.0 
1,185.5 
+797.4 
III________-. 
996.6 
+358.4 
221D-886-I ______ 
b 396.4 
2,200.3 
1.347.8 
1.672.8 
1,033.3 
1,814.1 
+363.1 
II______ 
+386.2 
III._________ 
1,071.6 
1,439.5 
+276.2 
221E-885-I__ ___- 
+233.4 
II... ___ 
1, 218. 3 
1,069. 5 
+148.8 
221F-874-1 ____ 
2,494.4 
1,688. 5 
2, 254.6 
1,434.0 
+239.8 
II_______ 
+254.5 
221F-887-I ..-______ 
2,168.7 
i; 934.3 
+234.4 
II______ 
1,499.6 
1,649.6 
-150.0 
« Not corrected for loss on drying. 
The respiration calorimeter is not equipped for weighing the animal. 
The subject is weighed, however, just before entering, and again as 
it is removed from the chamber. In every period there was a loss 
in live weight during the calorimetric measurements. This is largely 
due to the failure of the cows to drink as much water while in the 
calorimeter as during the 10-day digestion period. 
As in previous work of the institute, the heat emission of the animal 
was determined by direct measurement on two consecutive days of 
the experimental period. The methods used and a description of the 
apparatus employed have been covered in detail in the various pub¬ 
lications of Armsby and Fries. The heat emission per day—by 
radiation and conduction and as latent heat of water vapor—is 
given in Table XIV. 
Table XIV .—Daily emission and production of heat 
Experiment, animal, and period Nos. 
Heat 
emission 
Correction 
for body 
gain 
Heat 
production 
221D-885-I ___ 
Cals. 
8,462.8 
Cals. 
-82.5 
Cals. 
8,380.3 
II ______ 
,9,667.7 
-60.3 
9,607.4 
III___ 
8,845.7 
8,252.2 
-29.0 
8,816.7 
221D-886-1 - - - _ ___ 
-193.6 
8,058.6 
if _ __ _ 
10,603.8 
-129.3 
10,474.5 
in _ ____- 
8,030.0 
-115. 9 
7,914.1 
221E-885-1 . - ___ 
9,791.2 
-69.5 
9,721.7 
II______ 
8,773.4 
-37.9 
8,735.5 
221F-874-1 . ___ 
11,037.1 
-72.9 
10,964.2 
II__ 
9,106. 3 
-29.5 
9,076.8 
221F-887-I ... _ _ 
10,451.1 
-123.9 
10,327.2 
ii ____ 
8,446.7 
-51.7 
8,395.0 
