462 
Journal of Agricultural Research 
Vol. XI, No. 10 
Table XVI .—Net energy values of total rations per kilogram of dry matter 
Gross 
energy 
(Table IX). 
Losses in 
excreta 
(Table IX). 
Heat 
increment 
(Table 
XIII). 
Net energy 
value. 
Period 1 . 
Period 2. 
Calories. 
4,488 
4,470 
Calories . 
r » 739 
1,693 
Calories. 
} h 197 
Calories. 
I h 552 
l 1,580 
Period 3. 
Period 4. 
4,481 
4,478 
1,670 
1,728 
} 1,256 
/ 1 ,555 
l 1 ,494 
Average for light rations. 
4,483 
1,733 
1,227 
1,523 
1,567 
Average for heavy rations. 
4,476 
1,682 
1,227 
Average in unfattened condition. 
4,479 
1,716 
1,197 
1,256 
1,566 
Average in fattened condition. 
4,480 
1,699 
1,525 
On the average of the experiments of the previous year on the same 
animal 1 kgm. of dry matter of the alfalfa hay increased the heat pro¬ 
duction of the animal by 1,018 Calories. If the values for the hay are 
assumed to be the same as those found in the previous year’s experiment, 
the net energy values of the mixture of concentrates may also be com¬ 
puted as in Tables XVII and XVIII. Obviously this method of com¬ 
putation ascribes the entire difference between the results in the several 
periods to the concentrates and therefore tends to exaggerate it 
relatively. 
Table XVII .—Computed energy expenditure per kilogram of dry matter of concentrates 
Period No. 
* 
Dry matter eaten. 
Total heat 
production. 
Hay. 
Concen¬ 
trates. 
Period 2. 
Gm. 
3, °88.4 
1,507.6 
Gm. 
6,037. 9 
2, 955 - 3 
Calories. 
16,511 
10,905 
Period 1. 
Difference... 
1, 580. 8 
3,102. 6 
5,606 
1,609 
Difference due to hay. 
Differences due to concentrates. 
3,997 
1,288 
Difference per kilogram of concentrates. 
Period 3. 
3 , 335 * 1 
754 - 3 
6, 576 . 5 
3 ,461. 3 
19,992 
14, 095 
Period 4. 
Difference. 
1, 580. 8 
3 >nS -2 
5,897 
1, 609 
Difference due to hay. 
Difference due to concentrates. 
■ 
4, 288 
1,376 
Difference per kilogram of concentrates.j. 
