6 l2 
Journal of Agricultural Research 
Voi. xr, No. ii 
4. The chest becomes relatively deeper. 
5. The chest becomes relatively wider. 
6. The loin becomes relatively wider. 
7. The croup becomes relatively longer. 
8. The leg length remains nearly the same. 
In relation to total length of body in developing from 14 days to 280 
days (comparing columns 6 and 4). 
1. Head narrows and becomes shorter. 
2. Neck remains nearly similar in length. 
3. Fore and hind legs become much shorter. 
4. Chest depth increases. 
5. Chest width does not change significantly. 
6. Chest depth consequently increases in proportion to chest width. 
7. Loin width does not change significantly. 
8. Croup length does not change significantly. 
These conditions are quantitatively expressed by percentage of in¬ 
crease in column 7. The general deduction is that total height, head 
width, and leg length increase to about the same relative degree and show 
least change; chest and loin width, and croup and trunk length show a 
more marked increase; chest depth increases relatively much more 
than any other dimension, and that dimensions of width increase rela¬ 
tively slightly in excess of dimensions of length, the latter (length) being 
similar in neck and trunk but less in the head. 1 
These conditions are further illustrated in figure 1, A-D, in which 
A and B represent the horizontal plane limited by the total length of verte¬ 
bral axis and the structurally important transverse dimensions of head 
width, chest width, and loin width. B represents size and proportions 
at 280 days, and A, the proportions at 14 days enlarged to equal length 
of B. 
Figure 1, C and D, represents two vertical planes of limits at 14 and 
280 days, respectively, where total height, chest depth, leg length, and 
trunk length are shown in relation to each other. C represents the pro¬ 
portions at 14 days enlarged to equal to the total height of D. 
RATE OF GROWTH BY PERIODS 
Table II shows measurements and weights by periods for each dimen¬ 
sion recorded. A comparison of the quantitative values of dimensions 
in the upper portion of the table gives a general idea of increase made by 
each character during each period. The ratios below show some of the 
changes that occur in the relative proportion between different characters. 
1 The necessity for an unequal rate of development of the various characters becomes obvious when we 
consider the differences in conformation between the young and the adult stage. 
