Dec. 1,1925 
The Maintenance Requirement of Dry Cows 
1079 
THE NET-ENERGY VALUE OF THE RATION 
In computing the net-energy value of the ration the writers have 
followed the improved procedure of Kriss (7). Table XXIII contains 
the data necessary to arrive at the total net energy of the ration. 
The items for energy gained are obtained by subtracting the heat 
production (computed to the standard day) from the metabolizable 
energy of the feed* 
Table XXIII .—The gains of energy by the animals and the total energy of the ration 
Experiment, animal, and period Nos. 
Metabo¬ 
lizable 
energy 
Based on observed heat production <* 
Observed 
heat 
production 
Energy 
gained 
Net energy 
for main¬ 
tenance 
Total net 
energy of 
ration 
221D-886-I_ 
Cals. 
9,261.0 
15,132.4 
9,364.8 
14,758.9 
9,597.3 
13,636.3 
9,010.0 
Cals. 
8,084.9 
10,551.2 
8,026.4 
10,966.9 
9,093.2 
10,205.8 
8,273.6 
Cals. 
+1,176.1 
+4,581.2 
+1,338.4 
+3,792.0 
+504.1 
+3,430.5 
+736.4 
Cals. 
3,905.3 
3,905.3 
3.905.3 
5.299.4 
5,299.4 
4,360.0 
4,360.0 
Cals. 
5,081.4 
8.486.5 
5,243.7 
9,091.4 
5.803.5 
7.790.5 
5,096.4 
II___ 
III___ 
221F-874-I_ 
II.... 
221F-887-I_ 
II__ 
° Heat production computed to standard day of 12 hours standing and 12 hours lying. 
Tables XXIV and XXV present the net-energy value of the ration, 
as determined with three dry cows, expressed in terms of percentage 
utilization of the metabolizable energy, and as per kilogram dry 
matter of the ration. Cow 885 has been excluded from consideration 
on account of the persistent refusal of feed, which has been shown to 
vitiate the values found. 
Table XXIV .—The percentage utilization of the metabolizable energy of the ration 
Experiment, animal, and period Nos. 
Metaboliz¬ 
able 
energy 
Based on the observed 
heat production • 
Total net 
energy of 
ration 
Percentage 
utilization 
of the 
metaboliz¬ 
able energy 
221D-886-I___ 
Cals. 
9,261.0 
15,132.4 
9,364.8 
14,758.9 
9,597.3 
13,636.3 
9,010.0 
Cals. 
5,081.4 
8.486.5 
5,243.7 
9,091.4 
5.803.5 
7.790.5 
5,096.4 
Per cent 
54.9 
56.1 
56.0 
61.6 
60.5 
57.0 
56.6 
II_____ 
III____ 
221F-874-I______ 
II_ _____ 
221F-887-I — __ —.. 
II .... .. 
a Heat production computed to standard day of 12 hours standing and 12 hours lying. 
