MILK PEODUCTION AND BODY INCREASE OF DAIRY COWS 
11 
Table 4. — Digestion coefficients (apparent digestibility — feed minus feces) 
Organic matter 
Crude 
fiber 
Cow 
No. 
! 
Dry 
matter 
In 
terms of 
energy 
(calo- 
ries) 
Protein 
Non- 
protein 
Nitro- 
gen-free 
extract 
Ether 
extract 
Total 
nitro- 
gen 
Carbon 
631.. 
fl 
II 
III 
True aver- 
age 
[I .... 
Per cent 
67.93 
66.80 
67.52 
Per cent 
69.51 
68.59 
69.26 
Per cent 
66.67 
65.93 
66.75 
Per cent Per cent 
73. 47 70. 80 
73. 19 65. 52 
72. 45 79. 77 
Per cent 
34.20 
32.34 
33.02 
Per cent 
77.77 
76.97 
77.69 
Per cent 
75.36 
77.12 
76.23 
Per cent Per cent 
74. 06 ' 67. 19 
70.70 j 66.39 
71.78 67.14 
67.42 
69.12 
66.45 
73.04 
72.39 
33.19 77.47 ! 76.24 
72.18 
66.91 
67.11 
68.50 
69.26 
68.95 
65. 99 1 72. 26 75 fifi 1 33 91 7fi 1 S ! 78 78 
73.53 
73.50 
70.19 
66.38 
II 
67.90 
67.57 
66. 84 i 76. 09 
1 47. 97 
38.09 76.18 
77.24 
67.14 
III.. 
66. 62 72. 42 
82.16 
31.06 77.42 
79.24 
66.94 
615.. 
True aver- 
age 
fl 
67.53 
68.91 
66.48 ' 72.34 
78.91 
34.36 
76.58 
78.41 
72.41 
66.82 
69.65 
69.09 
71.20 
70.47 
68. 83 75. 38 
68. 32 75. 47 
65.36 
62.64 
38. 08 78. 89 
36.01 , 78.34 
79.85 
79.78 
74.99 
74.55 
69.24 
II 
68.57 
True aver- 
age 
69.37 
70.84 
68. 57 75. 43 
64.00 
1' 
37.05 78.62 
79.81 
74.77 
68.90 
1 Omitted from the average. 
In Table 5 the figures for the urine represent the average for nine 
days, except with cows 631 and 579, period I, in which cases the 
average includes but eight days because of an accident to some of 
the samples. 
HAIR AND SCURF REMOVED BY BRUSHING 
The daily growth and loss of hair plus the epithelial offal, or 
dandruff, may be considered either as a gain of substance together 
with other forms of production, or as an excretory product. Since in 
the dairy cow this material is not a desired product, is not accumula- 
tive on the animal, and can not, like protein and fat, be again meta- 
bolized as a nutrient either in or out of the animal body, it has 
seemed wisest to treat it as an excretum. The quantity and com- 
position of this daily loss are found in Table 6. 
MILK 
The quantity and composition of the milk are given in Table 7. 
Table 5. — Average daily excretion of nitrogen, carbon, and energy in urine 
Cow No. 
Period 
Weight 
Dry 
matter ' 
1 
Total 1 T t , 
Organic 
matter as 
energy 
631 
1 « 
I HI 
t HI 
{ £ 
Grams 
6, 540. 6 
7, 536. 
7,141.7 
6,131.8 
6, 860. 4 
6, 970. 
6, 867. 5 
7, 685. 1 
Grams 
586 
626 
530 
512 
500 
393 
544 
492 
Grams Grams 
105.41 163.58 
132 33 i"7 2K 
Calories 
1,583.8 
1 691 1 
615 . 
117.98 
94.98 
96.53 
99.70 
101.88 
112. 14 
154.55 
138. 82 
146.47 
150. 55 
151.63 
163. 15 
1.431.7 
1,323.4 
1,409.2 
1,406.3 
1,487.2 
1.611.3 
579 
1 The dry matter was computed from the charges of urine which were dried sufficiently for the com- 
bustion in the bomb calorimeter, but not absolutely dry They are, roughly, 5 per cent high. 
> Average of the total nitrogen in the daily urine. 
