Dec. 1,1925 
Revised Net-Energy Values of Feeding Stuffs 
1087 
Table II .—Data for computation of net-energy values —Continued 
Time 
Dry matter 
eaten 
Metab- 
Heat 
produc¬ 
tion 
Experiment No. and feeding stuffs 
Ani¬ 
mal 
Peri¬ 
od 
spent 
stand¬ 
ing per 
day 
Rough- 
age 
Con¬ 
cen¬ 
trates 
olizable 
energy 
of 
ration 
cor¬ 
rected 
to 12 
hours 
stand¬ 
ing 
Cain 
of 
energy 
by 
animal 
216. Alfalfa hay and starch_ 
J 
1 
Hours 
8.79 
Kg. 
6.2486 
Kg'. 
2.5724 
Cals. 
20,860 
Cals. 
15, 623 
Cals. 
+5,237 
Do-—... 
J 
2 
9.26 
2.6454 
1.1050 
8,854 
9,600 
-746 
Do_ 
J 
3 
7.57 
3.7477 
1.5511 
12,019 
10,924 
+1,095 
Do_ 
J 
4 
9.51 
1.7540 
.7260 
5,628 
8,026 
-2,398 
Alfalfa hay_ 
J 
5 
8.97 
7.8930 
15,100 
11,954 
6,902 
12,269 
25,398 
12,818 
10,954 
8,315 
10,954 
+2,282 
+1,000 
-1,413 
+1,315 
Do.——___ 
J 
6 
7.13 
6.1278 
Do.-.-. 
J 
7 
8.49 
3.5016 
217. Alfalfa hay and grain mixture No. 3 _ 
J 
1 
10.15 
1.5076 
2.9553 
Do-—.. 
J 
2 
13.37 
3.0884 
6.0579 
16,604 
+8,794 
Do_ 
3 
17.56 
3.4395 
6,7872 
28,747 
21,002 
+7,745 
Do_—__ 
° J 
4 
13.01 
1.7543 
3.4613 
14,338 
14,187 
+151 
220. Red clover hay__ 
K 
1 
11.12 
5.9523 
11,365 
7,972 
11,292 
18,132 
12,151 
10,300 
10,838 
-786 
Do__ 
K 
2 
11.62 
3.9415 
-2,328 
+454 
Red clover hay and corn meal. 
K 
3 
9.25 
1.3279 
2.6017 
Do___ 
K 
4 
10.27 
2.2717 
4.3630 
13,899 
+4,233 
Do_ 
K 
5 
13.81 
.9087 
1.7475 
7,383 
10,001 
-2,618 
* Fattened. 
REVISED METHOD OF COMPUTATION OF NET-ENERGY VALUES 
A detailed description of the new method of computing net-energy 
values, supplemented by a number of examples, showing the advan¬ 
tage of this method over those previously used, has already been 
published by one of the writers (11), and to avoid unnecessary repeti¬ 
tion the description here will be general. 
The distinguishing feature of tnis method is that it makes possible 
the computation of a net-energy value of a feed for each of a series 
of experimental periods, instead of giving only one value representing 
results of two or more periods, as accomplished by the earlier methods. 
The computation is carried out according to the following general 
procedure: 
(1) The daily gain of energy by the animal in each experimental 
period of a series is computed by subtracting the daily heat produc¬ 
tion 4 from the metabolizable energy of the ration (see Table 2, last 
column). 
(2) The heat increment per kilogram of dry matter of a feed is 
computed by comparing the dry matter and the heat production of 
each period with the dry matter and the heat production of the other 
periods. The difference in heat production divided by the differ¬ 
ence in dry matter of feed consumed (kilogram) gives the increment 
of heat production per kilogram of dry matter. The values thus 
obtained are averaged. 
(3) The total heat increment caused by the feed is computed by 
multiplying the total dry matter of the feed (kilogram) by the average 
heat increment per kilogram of dry matter, as obtained in (2). 
(4) The net energy required for maintenance is computed by sub¬ 
tracting the total heat increment caused by the ration, in each period, 
* Corrected to 12 hours standing and 12 hours lying. This is also implied in the subsequent uses of 
this term. 
