June i, 1921 
Effect of Ration on the Development of Pigs 
303 
HEART WEIGHTS IN RELATION TO EMPTY WEIGHT AND TO WEIGHT OF 
PROTEIN 
The figures for the weight of the heart in relation to empty weight are 
plotted in figure 9, and in relation to protein weights in figure 10. The 
figures for empty weight and protein weight are used as abscissas, and 
the weights of heart, expressed in tenths of a pound, are used as ordinates. 
The weight of the heart increases as the size of the body or as the amount 
of protein increases even more regularly than the weight of lungs. 
WEIGHT OF THE DIVER IN RELATION TO EMPTY WEIGHT AND WEIGHT OF 
PROTEIN 
The curve for the weights of the liver in relation to empty weight is 
plotted in figure 11, and in relation to protein weights in figure 12. The 
weights of the liver seem to vary in proportion to the empty weight or the 
weight of the protein more than any of the other organs studied. 
KIDNEY WEIGHT IN RELATION TO EMPTY WEIGHT AND WEIGHT OF PROTEIN 
The relation between the weight of the kidneys and the empty weight, 
and also between the kidney weight and the weight of protein, is graphi¬ 
cally presented in figures 13 and 14. The kidneys become larger as the 
pigs increase in size, and this increase in size is very irregular. There 
seems to be no correspondence between the character of ration and the 
size of kidney. The largest kidneys weighed 1.06 pounds and were 
found in the pig fed corn and milk protein every seventh day. The kid¬ 
neys in the pig in the same experiment fed seven times this amount of 
protein weighed 0.95 pound. 
CONCLUSIONS 
1. The specific character of the ration has, in general, the same effect 
on the development of the internal organs as on the development of the 
body as a whole. 
2. A ration that will produce a large development of the body as a 
whole will also produce large development of the internal organs. 
3. The relative smallness of the internal organs in some pigs of 
restricted growth is due to the overdevelopment of fat. 
4. In general, the development of internal organs is also in proportion 
to the increase of protein. A ration that will produce a large amopnt of 
protein will produce large internal organs. 
