Sept. 1,1925 
Net-Energy Values of Feeding Stuffs 
481 
This experiment presents a striking example of what the writer 
believes is the advantage of computing net-energy values according 
to the new procedure. 
According to the current method, the average net-energy value of 
the alfalfa hay, using the heat increment of the extreme periods 
(1 and 5, Table XV), would be 2,048—1,043 = 1,005 Calories per 
kilogram of dry matter, and of the alfalfa meal 2,014—1,160 (heat 
increment of 2 and 6) = 854 Calories. By using the average of all 
heat-increment values of the hay and meal, respectively, the average 
net-energy value would be 2,048—1,034 = 1,014 Calories per kilo¬ 
gram of dry matter of alfalfa hay, and 2,014—1,127 = 887 Calories 
per kilogram of dry matter of the alfalfa meal. Hence, in both cases, 
the average net-energy value of the meal is considerably lower than 
that of the hay, when computed by this method. 
Table XVI .—Computation of maintenance requirement 
Period No. 
Dry matter eaten 
Average 
heat in* 
crement 
per kilo¬ 
gram of 
dry 
matter® 
Total 
heat in¬ 
crement 
of ration 
Total 
beat 
produc¬ 
tion 
Net en¬ 
ergy for 
main¬ 
tenance 
Alfalfa 
bay 
Alfalfa 
meal 
1 .. 
Kgms. 
6.6383 
Kgms. 
Cals . 
1,034 
1,127 
1,034 
1,127 
1,034 
1,127 
Cals. 
6,864 
7,518 
5,501 
6,095 
3,156 
3,556 
Cals. 
11,134 
10,946 
9,843 
9,767 
7,394 
6,868 
Cals. 
4,270 
3,428 
4,342 
3,672 
4,238 
3,312 
2.. 
6.6707 
3. _•... 
5.3202 
4.... 
5.4078 
5... 
3.0524 
6. 
3.1549 
Average 
3,877 
1 
• Average of all values of bay and meal, respectively. 
Table XVII .—Computation of net-energy values of alfalfa hay and alfalfa meal 
Feeding stuff 
Period 
No. 
Dry 
matter 
eaten 
Net en¬ 
ergy for 
main¬ 
tenance 
Gain 
Total net 
energy of 
ration 
Net en¬ 
ergy per 
kilogram 
of dry 
matter 
Alfalfa hay_ 
1 
Kgms. 
6.6383 
Cals. 
3,877 
3,877 
3,877 
Cals. 
+2,200 
+804 
Cals. 
6,080 
4,684 
2,993 
Cals. 
916 
Do...... 
3 
5.3203 
881 
Do... 
5 
3.0524 
■—883 
981 
Average _ 
926 
Alfalfa meal.. 
2 
6.6707 
3,877 
3,877 
3,877 
+2,269 
+891 
-286 
6,169 
4,771 
3.596 
925 
Do.... 
4 
5.4078 
882 
Do.... 
6 
3.1549 
1,140 
Average_ 
982 
The net-energy values of the alfalfa hay for the different periods, as 
computed by the new method, show a fair agreement, the average 
being 926 Calories per kilogram of dry matter. The net-energy 
values of the alfalfa meal show a good agreement between periods 2 
and 4, and a large deviation from the other values in period 6. Ex¬ 
cepting this last period the values for the meal do not differ materially 
from those of the hay. 
