June i, 1921 
Effect of Ration on the Development of Pigs 
3i7 
RELATION BETWEEN PROTEIN CONSUMED and the sum of ash, TROTEIN, 
AND EAT STORED 
The pig is not an economical machine for the storage of protein. In 
the preceding pages it has been shown that the most narrow ratio in 
protein storage was 1 to 2.85. That is, 1 pound of protein was stored 
for nearly 3 pounds consumed. This pig stored 16.85 pounds of protein, 
though the ration contained 21.85 pounds of protein from casein and 
24.84 pounds from corn. Protein from milk when fed in medium amounts 
was the most efficient. When other protein from animal sources was 
used, the ratio was wider. The pig which was fed 142 pounds of protein 
from black blood albumen and 118 pounds from corn stored only 24.27 
pounds of protein, or less than 1 pound for more than 10 pounds con¬ 
sumed. The other principal constituent which the pig stores is fat. 
While protein can come only from the protein of the feed, the fat can 
come from the carbohydrates and the fat in the feed and also from the 
protein. The ash or mineral matter can come only from the ash of the 
feed. 
The problem in this case is to compare the sum of ash, protein, and 
fat stored by each pig during the experiment with the amount of protein 
consumed. To what extent does the supplementary protein added to 
the corn stimulate the storage of these three constituents ? 
The five pigs noted above, two of which lost weight and the other of 
which gained only small amounts, will not be included in the compar¬ 
isons which follow. 
SUM OE CONSTITUENTS STORED FROM CORN FED ALONE OR WITH ASH 
When pigs were fed corn alone they stored on the average 1 pound of 
protein for 7.5 pounds consumed. The digestible portion of the other 
6.5 pounds of protein, together with the digestible fat and carbohydrates 
in the ration, were used for the production of energy and for the storage 
of fat. The amount of total constituents stored are presented in Table 
XIII, together with the figures on protein consumption. 
Table XIII .—Relation of ash plus protein plus fat stored to protein consumed 
Ash plus 
Protein consumed. 
Experi¬ 
ment No. 
Ration. 
protein 
plus fat 
stored. 
From 
corn. 
From 
supple¬ 
ment. 
Ratio. 
II 
Corn alone. 
58.46 
46.83 
44.09 
31.01 
60. 70 
42.58 
36.07 
41.87 
31.72 
37-17 
27.25 
203.73 
I 90-75 
1.3:1 
IT 
Corn and ash. 
1.3:1 
IV 
Corn alone. 
1.1: i 
IV 
Corn and ash. :... 
1.0:1 
IV. 
Corn and protein-free skim milk. 
3 - 2 4 
1.5:1 
V 
Corn alone. 
26- 55 
231.08 
225.67 
1.1:1 
III-V. ... 
III-V. ... 
Corn and ash (continuation hog). 
Com and protein-free skim milk. 
16.03 
1.1:1 
1.1:1 
