Nov. a?, 1916 Energy Values of Red-Clover Hay and Maize Meal 381 
PERCENTAGE DIGESTIBILITY OF RATIONS 
From the daily records of feed and excreta and their chemical com¬ 
position the percentage digestibility of the several rations has been 
computed in the usual manner, with the results shown in Table III. 
It was assumed that in the mixed rations the hay had the percentage 
digestibility shown by the average of the periods when hay was fed 
alone, and the percentage digestibility of the maize meal in Periods 
III, IV, and V has also been computed, with the results shown in the 
last three columns of the table. 
Table? III .—Digestibility of the rations 
Percentage digestibility of rations. 
Constituent. 
Clover hay. 
Clover hay and maize 
meal. 
Aver¬ 
age per* 
centage 
digesti¬ 
bility of 
clover 
hay. 
Computed percentage 
digestibility of maize 
meal. 
Period 
I. 
Period 
II. 
Period 
III. 
Period 
IV. 
Period 
V. 
Periods 
I and II. 
Period 
III. 
Period 
IV. 
Period 
V. 
Dry matter. 
55-88 
59-26 
78. 78 
73-22 
79. 20 
57 - 23 
89.78 
81. 54 
90. 63 
Ash.. 
28.57 
31.62 
41.94 
27. 22 
27.94 
29. 78 
68. 72 
21. 54 
23. 75 
Organic matter. 
57 - 56 
6a 97 
79-94 
74 - 58 
8a 72 
58.92 
90.15 
82.37 
9 i. 55 
Protein. 
35 - 29 
41.24 
62.44 
55-86 
63.00 
37- 66 
74 - 74 
65. 46 
76.34 
Crude fiber. 
SO- 23 
53-19 
54-22 
47 - 54 
46.55 
5 i. 4 i 
76. 27 
17. 42 
8.68 
Nitrogen-free extract. 
66. 24 
69. 76 
87.19 
82.04 
89.13 
67. 64 
93 * 19 
86. 61 
95 * 95 
Ether extract. 
49 -14 
54 - 29 
78.10 
76.30 
81.49 
Si* 19 
85. 52 
83. 96 
90.68 
Total nitrogen. . 
42. 87 
46.33 
60.82 
53 - 85 
62.01 
44 - 25 
69.68 
59 *. 21 
71. 77 
Carbon. 
54.10 
57 . 50 
77.85 
72.41 
78.32 
55.46 
89.32 
81. 25 
90. 23 
Energy. 
53*8o 
57. 20 
77.28 
71. 87 
77 - 65 
55-15 
88. 29 
80.40 
89.12 
METABOLIZABLE ENERGY 
The difference between the chemical energy of the feed and that lost 
in the excreta shows how much of the former is capable of transformation 
in the animal body. This has been called metabolizable energy. 
Computed in the same manner as in the earlier paper, the losses of 
chemical energy per kilogram of dry matter consumed and the metab¬ 
olizable energy remaining were as shown in Table IV, which includes 
also the percentage distribution of the feed energy between the various 
excreta on the one hand and the metabolizable energy on the other. 
The average results for the metabolizable energy per kilogram of dry 
matter and per kilogram of digestible organic matter are brought together 
for convenience in Table V. 
