Dec. 1,1925 
1077 
The Maintenance Requirement of Dry Gows 
Table XXI .—The net energy required for maintenance per heady computed to the 
standard day 
Experiment, animal, and period Nos. 
Dry 
matter 
eaten 
Based on observed heat production • 
Heat 
increment 
per kilo¬ 
gram dry 
matter 
Total heat 
increment 
Heat pro¬ 
duction 
Net energy 
for main¬ 
tenance 
221D-885-I... 
II_. 
III. 
Average. 
221D-886-I-- 
II- 
III. 
Average. 
221E-885-. 
II... 
Average. 
221F-874-I-. 
II. 
Average. 
221F-887-I- 
II. 
Average. 
Kg. 
3.6674 
5.4676 
3.8505 
Cals. 
611.9 
Cals. 
2.244.1 
3,345. 6 
2.356.1 
Cals. 
8.224.1 
9.495.1 
8,657.8 
3.8131 
6.0809 
3. 7821 
1,092.' 
4,167.3 | 8,084.9 
6,645.8 j 10,551.2 
4,133.5 8,026.4 
4. 7012 
3.4475 
756.1 
5. 9803 
4.0032 
5.4183 
3. 6274 
947.7 
1,078.9 
3, 554. 6 
2,606. 7 
9,510.8 
8, 562.9 
5,667. 5 
3, 793. 8 
10,966. 9 
9,093.2 
5,845.8 10,205.8 
3,913.6 | 8,273.6 
Cals. 
5,980.0 
6,149.5 
6,301.7 
6,143. 7 
3,917. 6 
3,905.4 
3,892.9 
3,905.3 
5,956. 2 
5, 299.4 
4,360. 0 
® Heat production corrected to standard day of 12 hours standing and 12 hours lying. 
It will be noted that the writers’ method of computation of the 
fasting katabolism is as given by Armsby (3, p. 282 , sect . 374, V ar - %)• 
This method should find general use, because it eliminates from con¬ 
sideration the gain or loss of energy by the body and does not make 
use of the metabolizable energy directly. It further serves to make 
clear the relationship existing between the net-energy value of the 
feed, the fasting katabolism, and the maintenance requirement. 
The fasting katabolism has been determined for these three animals 
through a comparison of the effect produced by two different quan¬ 
tities of the same feed. The essential data involved are included in 
Table XXI. 
The values given in Table XXI, represent the maintenance require¬ 
ments of these cows for a standard day of 12 hours standing and 12 
hours lying. The data are not strictly comparable, however, be¬ 
cause the differences in live weight have not been taken into account. 
For comparative purposes, therefore, the values given in Table XXI 
for the maintenance requirement of the experimental subjects have 
been computed to uniform live weights of 500 kg. and 1,000 pounds, 
these data comprising Table XXII. The data for cow 885 have not 
been so computed because of their doubtful accuracy. 
