16 BULLETIN 1281, U. S. DEPARTMENT OF AGRICULTURE 
Table 11. — Income and outgo of nitrogen and carbon per day and -per head 
Cow 631, period I 
Cow 631. period II 
Cow 631, period III 
Nitrogen 
Carbon 
Nitrogen 
Carbon 
Nitrogen 
Carbon 
o M 
§ " 
s *2 
i i 
I 1 
Gms. Gms. Gms. ' Gms. Gms. Gms. Gms. Gms. Gms. Gnu. Gms. Gms. 
Alfalfa hav..._ „ 85.4 1,335.0 84.9 .1.346.7 89.3 1,355.8 
Composite grain 105.8 1,979.7 105.2 1,956.0 104.8 1,940.9 
3.1 
Refused feed. 
Feces.. 49.6 ,1.057.4 55.7 
Urine 105.4 163.6 132.3 
Brushings 1.9 10.3 1.3 
Milk.... 38.3 483.9 
Milker 3.9 
Methane 147. 4 
Carbon dioxide 1,409.8 1.507.8 1,589.4 
Difference 4.0 16.2 6.0 ;. 29L9 19.3 318.2 
195.2 195.2 3,318.6 3.318.6 196.1 196.13,305.8 3,305.8 194.1 194.13,296.7 3,296.7 
- 0.6 10.2 
1,109.9 54.6 ..1,079.8 
177.3 11S.0 154.6 
7.3 1.6 8.8 
70.1 
141.1 '.""'. '.'.'.'." '...'.'." "I35.~7 
Cow 615, period I 
Cow 615, period II 
Cow 615, period III 
Nitrogen Carbon Nitrogen Carbon Nitrogen Carbon 
g 1 
5 1 
S z 
Gms. Gms. Gms. Gms. Gms. Gms. Gms. Gms. Gms. Gms. Gms. Gms. 
Alfalfa hay 87.6 1,369.2 87.1 1,381.2 91.6 1,390.6 
Composite grain 109.6. 2,052.4 109.1 2,027.8 108.7 2,012.3 
52 2 1,150.5 52.0 1,120.3 59.7 1,125.1 
95.0 138.8 96.5. 146.5 99.7 150.6 
2.0 10.0 1.8. 9.1 1.7 8.3 
44.6 542.4 47.1 556.7 46.3 550.8 
5.3 5.7 6-1 
134.9 135.7 137.8 
1,408.6 1,459.8 1,491.5 
.... 41.7 1.2^ 13.4 7.1 55.1 
Urine. ... 
Brushings 
Milk 
Milker 
Methane 
Carbon dioxide 
Difference 3.4 
197.2 197.2 3,426.9 3,426.9 197.4 197.4 3,428,13,428.1 207.4 207.4 3,464.13,464.1 
Milker 
Methane 
Carbon dioxide. 
Difference 
Cow 579 
period I 
Cow 579, period II 
Nitrogen 
Carbon 
Nitrogen Carbon 
1 
Income 
Outgo 
Income 
Outgo 
Income 
Outgo 
Income Outgo 
Alfalfa hay 
Grams 
96.5 
119.4 
Grams 
Gram* 
1,53L5 
2,220.1 
Grams 
Grams 
101.6 
119.6 
Grams 
Grams Grams 
1.541.S 
Composite grain 
2,214.4 
54.0 
101.9 
1.3 
49.2 
1, 154. 
151.6 
6.6 
630.6 
56.3 
112.1 
1.6 
49.4 
1, 180.7 
163.2 
Brushings 
8.2 
Milk 
59S.3 
5.4 
156.6 
1,622.9 
34.7 1.8 
6.3 
159.0 
1.597.2 
215.9 
215. 9 ! 3. 757. 3, 757. 
221.2 
221. 2 3, 762. 5 3. 762. 5 
The sum of the daily excretions represents a definite amount of 
energy, and this energy in the last analysis represents feed energy. 
Hence it is the difference between the gross energy of the feed and 
