1078 
Journal o f Agricultural Research 
Vol. XXXI, No. 11 
Table XXII. —The net energy required for maintenance computed to the standard 
day and to uniform live weight 
Experiment, animal, and period Nos. 
Live 
weight 
Net energy for maintenance 
As deter¬ 
mined, 
observed 
Per 500 
kilograms 
live 
weight ° 
observed 
Per 1,000 
pounds 
live 
weight ° 
observed 
221D-886-I____ 
Kg. 
399.8 
424.4 
420.2 
Cals. 
3,917.6 
3,905.4 
3,892.9 
Cals. 
4.547.8 
4,357.0 
4.370.9 
Cals. 
4,267.0 
4,088.0 
4,101.1 
II____ 
III____ 
Average_____ 
414.8 
3,905.3 
4,425.2 
4,152.0 
221F-874-I.... 
} 422.2 
} 327.9 
5,299.4 
4,360.0 
5,932.1 
5,776.7 
5,565.9 
5,420.0 
II..... 
221F-887-I-_____ 
II_______ 
a Computed in proportion to the two-thirds power of the live weight. 
That there should be material variation in the maintenance re¬ 
quirements of these three animals is to be expected from their be¬ 
havior under the experimental conditions. Cow 886 was extremely 
quiet, was not restless when the attendants were working around 
her, and spent more than half of the experimental time in the lying 
position. Cow 874 also spent about half her time lying quietly, but 
when standing was much more restless. Cow 887 stood the greater 
part of the time, and while in the respiration calorimeter was addicted 
to rubbing vigorously against the side of the stall, and while lying 
would shift suddenly from one side to the other without arising. 
In interpreting the figures given as representing the maintenance 
requirements of the subjects of this investigation, it must be kept in 
mind that direct comparison of the individuals, one with the other, is 
possible only after the data have been reduced to a common basis as 
regards standing and lying, and to a uniform live weight. This 
having been done, then the variations observed are due to individual 
differences in the animals studied. 
THE NET ENERGY REQUIRED FOR MAINTENANCE COMPUTED 
TO THE STANDARD DAY AND TO UNIFORM LIVE WEIGHT 
The average net energy required for maintenance of each of the 
three cows, as directly observed, and expressed in therms per 500 kg. 
live weight (Table XXII) is: Cow 886, 4.424 therms; cow 874, 5.932 
therms; cow 887, 5.777 therms. The values as determined are not 
complicated bv the requirements of fetal growth, since cow 886 was 
but two months pregnant at the beginning of the last experimental 
period of which she was the subject, and cows 874 and 887 had not 
been bred. 
In experiment 22IF there were two periods only with each cow. On 
this account the values given for the maintenance requirement of 
cows 874 and 887 must be taken as reresentative of the average of the 
live weights of the two periods. The difference in live weight is small 
in each case and has no material influence on the determined values. 
