40 
BULLETIN 561, U. S. DEPARTMENT OF AGRICULTURE. 
Digestible protein, energy values, and total dry matter of the 
feedstuffs, as given in Department of Agriculture Bulletin No. 459, 
are shown in Table 14. These values are those worked out for farm 
animals; no figures of this kind are available in poultry feeding. 
Detailed figures showing the energy values of the rations used are 
given in Table 15, based on the assumption that these figures apply 
more or less accurately to poultry. 
Table 14. — Average dry matter, digestible true protein, and net energy values in 100 
pounds of various poultry feeds. 
Feed. 
Dry 
matter. 
Digestible 
protein. 
Net 
energy. 
Feed. 
Dry 
matter. 
Digestible 
protein. 
Net 
energy. 
Wheat 
Pounds. 
89.8 
90.8 
89.5 
90.7 
88.7 
Pounds. 
8.1 
8.7 
7.0 
8.3 
6.4 
Therms* 
. 91. 82 
67.56 
89.16 
89.94 
88.75 
Wheat bran 
Wheat middlings... 
Pounds. 
89.9 
89.6 
92.5 
92.5 
Pounds. 
10.8 
12.0 
45. 5 
35.4 
Therms} 
53.00 
Oats 
59.10 
72.96 
Cottonseed meal 
93.46 
i A therm is the quantity of heat required to raise the temperature of 1,000 kilograms (2,204.6 pounds) of 
water 1° C. It is equal to' 1,000 large, or kilogram, calories. 
Table 15'. — Dry matter, digestible protein, and energy values in 100 pounds of feed con- 
sumed. 
Pen. 
Year. 
Dry 
matter. 
Digest- 
ible 
protein. 
Net 
energy. 
Pen. 
Year. 
Dry 
matter. 
Digest- 
ible 
protein. 
Net 
energy. 
Pounds. 
Pounds. 
Therms. 
Pounds. 
Pounds. 
Therms. 
1 
1913 
90.0 
11.70 
ii.it 
i 
1914 
89.9 
11.58 
82.36 
1914 
90.2 
12.66 
76.50 
1915 
89.6 
9.35 
84.56 
1915 
90.0 
13.86 
74.82 
8 
1914 
90.0 
11.90 
82.50 
2 
1913 
1914 
89.6 
89.8 
10.17 
12.22 
85.04 
81.25 
1915 
89.8 
12.31 
82.38 
1915 
89.8 
13.46 
78. 57 
9 
1914 
1915 
89.8 
89.4 
8.46 
8.39 
78.64 
77.61 
3 
1913 
89.9 
10.33 
81.66 
1914 
89.8 
10.90 
82.16 
10 
1915 
90.1 
11.88 
79.77 
1915 
89.5 
8.88 
83.83 
11 
1915 
90.1 
12.46 
79.50 
4 
1913 
89.7 
11.06 
82.39 
1914 
89.9 
11.26 
82.38 
12 
1915 
89.8 
12.61 
82.34 
1915 
89.4 
8.24 
84.64 
14 
1915 
89. 9 
12.45 
77.25 
5 
1913 
89.8 
10.66 
81.58 
1914 
89.8 
11.52 
81.26 
15 
1915 
90.2 
12.46 
79.34 
1915 
89.8 
11.78 
81.06 
16 
1915 
90.2 
10.97 
80.68 
6 
1913 
1914 
1915 
90.4 
90.3 
90.1 
11.31 
11.16 
9.91 
82.81 
81.77 
81. 67 
SUMMARY. 
This bulletin shows the results obtained in feeding experiments 
covering 3 years' work. In the third year 16 pens were under obser- 
vation, containing a total of 366 laying hens. 
The average egg yield for the first laying }^ear in all pens was 131 
eggs, and the highest pen average yield was 169.5 eggs. In the 
second year the average egg yield of all pens was 92.7 eggs, which 
decreased to 78.2 eggs in the third laying year. 
