286 
Journal of Agricultural Research 
Vol. XXI, No. s 
Table II .—Chemical composition of control pigs 
Experiment No. 
Age of 
pigs. 
Empty- 
weight. 
Moisture. 
Ash. 
Protein. 
Ether 
extract. 
II. 
Months. 
4 K 
3 K 
A 
Pounds. 
rn 58 
Per cent. 
50-38 
49-03 
55- 67 
60. 50 
Per cent. 
3 - 30 
2. 79 
5 * 92 
Per cent. 
J 3 - °3 
11. 98 
16.35 
Per cent. 
Ill. 
5 °* 3 ° 
A r* 
27-39 
IV. 
37 * °5 
40. 97 
29. OO 
V. 
4 
0 
2 5 - 30 
14 - 87 
VI. 
34 * °3 
21. 72 
3. 06 
0 fir 
15* 4 2 
57 - 18 
2. Ol 
I 3 * 44 
15 - 15 
From experiment III, one pig from tlie lot fed corn and synthetic ash 
and one from the lot fed com and protein-free skim milk were continued 
on these feeds until they were nearly 3 years old. At the time the pigs 
from experiment V were slaughtered these two were included in the test. 
These two pigs are indicated by the name of the ration and the numerals 
III-V. For convenience these two are called continuation hogs, since 
they were continued from experiment III to the end of experiment V. 
CHEMICAL COMPOSITION OF REPRESENTATIVE PIGS 
The figures for percentages of moisture, ash, protein, and ether extract 
in representative pigs from different lots in these experiments are found 
in Table III. These figures were calculated on the basis of empty weight. 
For purposes of study these figures are arranged in the order of increasing 
empty weights, beginning with the smallest. 
MOISTURE CONTENT 
The figures for moisture percentages are plotted in figure 1, using the 
empty weights as ordinates and the percentages of moisture as abscissas. 
The roman numerals throughout the legends refer to the different experi¬ 
ments. On the whole, the percentage of moisture decreases as the size 
increases. This curve shows that these pigs can be divided roughly into 
three classes: (1) Below 100 pounds, (2) between 100 and 300 pounds, 
and (3) above 300 pounds. In pigs below 100 pounds the variations are 
irregular in the extreme, and all the pigs in this class had deficient rations. 
In the second class the variation is somewhat more regular, and there is 
no distinct tendency to decrease in percentage of moisture with increasing 
size. The pigs weighing more than 100 pounds and less than 300 pounds, 
which were fed a ration supplying both protein and ash in addition to 
corn have a tendency to carry a higher moisture content than those 
which were fed either protein or ash alone as a supplement. Above 300 
pounds the curve shows distinctly that the tendency is to a decrease in 
moisture as the size increases. Size is the predominating factor when 
toe ration produced an animal weighing between 300 and 400 pounds 
This is due to the accumulation of fat, as will be shown later 
