334 
Journal of Agricultural Research 
Vol. XXI, No. 5 
protein storage 
In calculations of the pounds of protein stored in the body it was 
assumed that the percentage of protein on the basis of live weight was 
ii for weights less than ioo pounds, io for weights between ioo and 200 
pounds, and 9 for weights above 200 pounds. These assumptions are 
based on average composition of pigs of similar weights. As the last 
period, 900 to 923 days, for two of the pigs is very short, the figures for 
this period should not be averaged or considered of any great significance. 
For calculating the thermal value of the protein stored, 1,860 calories 
per pound were used. This is not the total thermal value of the protein, 
but the thermal value of protein used as food. The figures as obtained 
are given in Table XXIII. They show that in the first 400 days of the 
experiment about 2 pounds of protein were stored by the corn and ash 
pig and 1.87 pounds by the corn and protein-free skim milk pig. In the 
period between 200 to 300 days the figures show a loss of protein. In 
this time there was a loss in live weight. As this loss was probably mostly 
fat, the figures for protein storage are no doubt low. The only value of 
these figures is the contrast between the low gains made in the first 400 
days of the experiment and those made in the last half. 
The increase in protein content in these pigs is shown graphically in 
figure 20. 
EAT STORED 
In the calculation of the amount of fat stored in the body it was 
assumed that the percentage of fat on the basis of live weight was gradu¬ 
ally increasing from 20 to 52 and 55 in the largest pig. This assumption 
is based on the average composition of pigs of similar size. The two pigs, 
one fed corn and ash the other fed com and protein-free skim milk, were 
slaughtered, so the percentage for fat for the last period is that actually 
found. The pig fed com alone was not slaughtered, and the figures were 
assumed. The figures for the last period of 23 days should be omitted 
for two of the pigs. In the calculation of the thermal value of the fat 
stored, 4,200 calories per pound of fat were used. 
According to these figures the pig fed corn and ash stored only 9 pounds 
of fat during the first 400 days and the pig fed corn and protein-free skim 
milk stored 7 pounds. These figures are probably low. 
The increase in fat storage by periods is graphically represented in 
figure 21. This serves to show the very large increase in fat during the 
later periods. 
RELATION BETWEEN VALUES OF FOOD CONSUMED AND NUTRIENTS 
STORED 
The pounds of protein stored divided into the pounds of protein 
consumed gives a ratio which serves to show, in a measure, the efficiency 
of the ration for storage of protein. In section III it has been shown that 
