June i, 1921 
Effect of Ration on the Development of Pigs 
3ii 
stored in the body and the amount that can be used for maintenance 
are measured by the minimal amount of any amino acid absolutely 
required. A protein that has a small proportion of any amino acid 
absolutely needed is less efficient than one in which the different amino 
acids are so balanced that they meet the requirements of the body. 
A protein that has a small amount of any amino acid absolutely needed 
is efficiently supplemented by another protein which has a relatively 
large proportion of this particular amino acid. 
FIVE) PIGS THAT WERE) STARVED 
The experiments reported herewith extended over a period of live 
years. The same feed gave different results in different years. The 
individuality of pigs played a part. There were five pigs in these different 
trials which either lost weight or made such small gains that they w r ere 
evidently starving. Two pigs, one fed corn and ash and the other fed 
com and protein-free skim milk in experiment III, lost protein from the 
body. Three pigs, one fed com and ash and one fed corn alone (experi¬ 
ment VI), and also one pig fed corn alone (experiment III), stored very 
small amounts of protein in proportion to the amount fed. These last 
three stored only 1 pound of protein for 24 pounds consumed. This 
is an abnormally wide ratio. These five pigs will be eliminated in the 
further discussion. 
PROTEIN STORED FROM CORN FED AlyONE OR WITH ASH 
Zein is the protein in com which occurs in larger amounts than any 
other. This protein is deficient in that it lacks the two amino acids, 
lysin and tryptophane, both necessary for growth and development. 
Table VIII .—Relation of protein stored to protein consumed 
Experi¬ 
ment No. 
Ration. 
Protein 
stored. 
Protein consumed. 
Ratio. 
From 
com. 
From sup¬ 
plement. 
v. 
Corn alone. 
Pounds. 
3 - 76 
4 - 58 
4. 86 
5 - 3 6 
5 - 7 ° 
6. 30 
24. 63 
29-75 
Pmitids. 
27.25 
31. 72 
41.87 
37 - *7 
36. 07 
42. 58 
203. 73 
190* 75 
Pounds. 
1:7.25 
1:6. 92 
1:8. 62 
1 - 7-54 
1:6.32 
1:6.77 
1:8.30 
1:6.95 
iv .:: 
Corn and ash. 
IV. 
Corn alone. 
IV. 
II. 
Com and protein-free skim milk. 
Com and ash. 
3 - 2 4 
II. 
Corn alone. 
m-v... 
III-V.... 
Corn and ash (continuation hog). 
Com and protein-free skim milk (con¬ 
tinuation hog). 
16. 03 
There were three pigs fed on corn alone, three fed corn supplemented 
with ash, and two fed corn supplemented with protein-free skim milk. 
This substance contained a small amount of nitrogenouscompo unds 
42209°—21-3 
