June i, 1921 
Effect of Ration on the Development of Pigs 
327 
3. When com was supplemented with a medium amount of protein 
from milk, amounting to nearly one-third of the total protein in the 
ration, the pigs stored 1 pound of protein for 3.5 pounds consumed. 
4. When com was supplemented with a large amount of protein from 
milk, from one-half to almost two-thirds of the total protein in the ration, 
the pigs stored on the average 1 pound of protein for 6 pounds consumed. 
The amount of protein stored varied from one-fourth to one-half the 
amount in the milk proteins consumed. 
5. A large amount of protein from other sources than com produces a 
more rapid rate of gain, but at the expense of the efficiency of protein 
storage. 
6 . The most efficient ration from the standpoint of protein storage is 
one which contains a small amount of protein from milk so combined 
with other feeds as to make a wide nutritive ratio. 
ASH, FAT, AND PROTEIN STORAGE 
7. When corn was fed alone the sum of ash, fat, and body protein 
stored was 1.1 pounds for each pound of protein consumed. 
8. When com was supplemented with a small amount of protein from 
milk, the sum of ash, fat, and body protein stored was 1.46 pounds for 
each pound of protein consumed. 
9. When com was supplemented with a medium amount of protein 
from milk the sum of ash, fat, and body protein stored was 1.41 pounds 
for each pound of protein consumed. 
10. When corn was supplemented with a large amount of protein from 
milk or other animal proteins the sum of ash, fat, and body protein stored 
was less than 1.1 pounds for each pound of protein consumed, a less 
efficient storage of nutrients than when com was fed alone. This state¬ 
ment leaves rate of growth out of consideration. 
11. Feeds combined so as to make a wide nutritive ratio produced 
the largest amount of storage of ash, fat, and body protein in relation 
to the amount of protein in the feed. 
FAT STORAGE 
12. Nine of the 24 pigs studied in these experiments stored more 
than 1 pound of fat for each pound of protein consumed. Among these 
9 the 4 which stored fat in largest amount in proportion to the amount of 
protein consumed were fed rations having a wide nutritive ratio. 
13. Most of the 24 pigs studied in these experiments stored 0.8 pound 
to 1 pound of fat for each pound of protein consumed. The source of 
protein did not seem to have any distinct influence. The protein from 
black blood albumen was as efficient for fat storage as the protein from 
milk. The 2 pigs fed till they were nearly 3 years old, and whose sole 
source of protein was com, stored fat as efficiently in proportion to the 
amount of protein consumed as the younger pigs which received protein 
from other sources than corn. 
42269—21 - 4 
