Dec. 1, 1925 
The Maintenance Requirement of Dry Cows 
1065 
Table IX. — Carbon and nitrogen lost per day during the drying of dung alone 
Experiment, 
animal, and 
period Nos. 
Dry 
mat¬ 
ter ° 
Water 
Nitro¬ 
gen 
lost 
Carbon lost 
Energy 
equivalents 
Energy of 
air-dry 
material, 
corrected— 
Total 
Com¬ 
bined 
with 
nitro¬ 
gen. 
NX 
0.429 
From 
car¬ 
bohy¬ 
drate 
NX 
5.45 
Starch 
CX 9.4 
Energy 
of 
air-dry 
ma¬ 
terial 
For 
nitro¬ 
gen 
For 
nitro¬ 
gen 
and 
carbo¬ 
hydrate 
fermen¬ 
tation 
Grams 
Grams 
Grams 
Grams 
Grams 
Grams 
Cals. 
Cals. 
Cals. 
Cals. 
Cals. 
221D-885-I_ 
1,095.0 
3,478.7 
0.6 
O) 
0.3 
‘9.8 
3.3 
92.1 
5,108.1 
5, 111. 4 
5,203. 5 
II- 
1,635.7 
8,346.0 
3.4 
O) 
1.5 
‘ 48.8 
18.5 
458.7 
7,665.4 
7\ 683.9 
8; 142.6 
111_ 
1,014.2 
4,103.1 
.6 
( b ) 
.3 
‘9.8 
3.3 
92.1 
4,753.0 
4,756.3 
4,848.4 
221D-886-I_ 
1,081. 7 
4,035.1 
1.0 
( b ) 
.4 
‘13.0 
5.5 
122.2 
4,999.9 
5; 005.4 
5, 127.6 
IX_ 
1,808. 5 
7,541.1 
2.5 
O) 
1.1 
‘35.8 
13.6 
336.5 
8,258.7 
8; 272.3 
8; 608.8 
III___ 
1,079. 7 
4,776.8 
.1 
0) 
.0 
‘.0 
.5 
.0 
5, 003.3 
221E-885-1_ 
1,279.8 
4,840.0 
1.8 
0) 
.8 
‘26.0 
9.8 
244.4 
6; 011.5 
6,021.3 
6,265.7 
II_ 
955.9 
3,974.6 
.7 
0) 
.3 
‘9.8 
3.8 
92.1 
4,425.8 
4; 429.6 
.4,521.7 
221F-874-I_ 
1,906.6 
7,201.9 
1.8 
«19.9 
‘.8 
‘19.1 
9.8 
179. 5 
8,979.4 
. 8,989.2 
. 9' 168.7 
II_ 
1,221.7 
3,848.0 
None. 
« 14.7 
.0 
‘14.7 
.0 
138.2 
5,733.7 
5' 871.9 
221F-887-I_ 
1,766.1 
7,153. 5 
6.5 
‘ 59.6 
2.8 
‘56.8 
35.4 
533.9 
8,294.7 
8,330.1 
S, 864.0 
II_ 
945.4 
3,441.0 
2.3 
<=18.0 
1.0 
‘17.0 
12.5 
159.8 
4,424.6 
4; 437.1 
4; 596.9 
Con s in milk 
221E-886-I_ 
1.3 
( h ) 
.6 
‘ 16.3 
2.8 
II_ 
2.2 
( b ) 
.9 
‘29.3 
4.9 
221E-874-I 
2.3 
( b ) 
1.0 
‘29.3 
4.9 
II_ 
1.7 
( b ) 
.7 
‘22.8 
3.8 
221F-886-I_ 
6.6 
52.7 
2.6 
50.1 
14.2 
II_ 
9.9 
75.6 
4.0 
71.6 
21.8 
221G-887-I_ 
3.4 
30.2 
1.4 
28.9 
7.6 
II—- 
1.4 
13.5 
.6 
12.9 
3.3 
III___ 
2.8 
22.1 
1.1 
21.0 
6.0 
IV____ 
2.3 
78.1 
.9 
77.2 
4.9 
1 
° Not corrected for loss on drying. 
b Not determined. 
‘ Computed; based on average figures. 
In this study the uncorrected dry matter must be used as the basis 
for the computations, because the analyses were made on the dried 
substance which had sustained the losses above referred to. There¬ 
fore, in the case of the dung and urine mixture, the appropriate 
corrections have been applied to the individual constituents affected. 
PRODUCTION OF EPIDERMAL TISSUE 
The cows were not clipped, as were the steers in the earlier experi¬ 
ments. The animals were thoroughly brushed, however, before 
being placed in the respiration calorimeter, and again on leaving it. 
The material obtained by this second brushing has been taken as 
representing the growth of hair, epithelium, etc., during the time 
spent in the calorimeter. Owing to the inadvertent destruction of 
a sample, the data for experiment 221D-886—I are incomplete. The 
average for Periods II and III was therefore used. The data for 
this loss are included in Table X. 
76649—261-6 
