1080 
Journal of Agricultural Research 
Vol. XXXI, No. 11 
Table XXV .—The net energy per kilogram of dry matter of the ration 
Experiment, animal, and period Nos. 
Dry matter 
eaten 
Based on the observed 
heat production ° 
Total net 
energy of 
ration 
Net energy 
per kilo¬ 
gram dry 
matter 
221D-886-I.... . 
Kg. 
3. 8131 
6.0809 
3. 7821 
5.9803 
4.0032 
5.4183 
3.6274 
Cals. 
5,081.4 
8.486.5 
5,243.7 
9,091.4 
5.803.5 
7.790.5 
5,096.4 
Cals . 
1.332.6 
1.395.6 
1,386.5 
1, 520. 2 
1.449.7 
1.437.8 
1,405.0 
II_ 
III__ 
221F-874-I_ _ 
II_ 
221F-887-I .-.. 
II_,_ 
« Heat production computed to standard day of 12 hours standing and 12 hours lying. 
The percentages of utilization of metabolizable energy given in 
Table XXIV show good agreement. The maximum is 61.6 per cent, 
the minimum 54.9 per cent, and the average for the series 57.7 per cent. 
It would appear from these data that individual differences exist 
in the expense of utilization of the metabolizable energy. These 
differences represent unlike energy expenditure, on various accounts, 
in the utilization of the feed, and also any such error as there may be 
in the determination of the maintenance requirement, the metab¬ 
olizable energy, and the heat increment. 
The experimental animals were apparently normal, average indi¬ 
viduals, and the data for percentage utilization seem to satisfactorily 
represent the net energy of the ration as a proportion of that which is 
metabolizable. 
The data presented in Table XXV represent the net-energy value 
of the ration expressed as Calories per kilogram of dry matter of the 
feed. The average value found is 1,418.2 Calories. 
In determining the rations to be fed during this series of experi¬ 
ments, the net-energy value of the ration was calculated from the 
average values for the hay and grain components as given by Armsby. 
(; 2) These data follow: 
Therms per kg. 
dry matter. 
Oats_ 1. 637 
Corn meal_„_2.113 
Wheat bran_ 1. 297 
Linseed meal_2. 152 
Mixed grain_ 1. 730 
Alfalfa hay_0. 824 
In ration used_ 1. 364 
The value obtained in experiment 221F-874-I (Table XXV) 
seems to be high, but no valid reason can be found for excluding it. 
Comparing the average value obtained in this series of experiments 
with that computed from Armsby ’s average values, the former is 4 
per cent higher. 
