Feb. 17, 1923 
Inheiitance in Swine 
575 
Table VIII presents the data from which these curves were constructed. 
The decrease in the number of individuals indicated in the earlier months 
was due both to deaths and to the fact that many of the animals were still 
young when the experiment was discontinued. After the eighth month 
the decrease was due mostly to sales. This, by culling out the larger 
individuals, may have been responsible for a certain amount of decrease 
in variability of the F 2 generation but was without effect upon the curve 
of the Fj generation for there were no sales from it and the deaths 
seemed to be normally distributed among the large and small animals. 
Fig. i.— Coefficients of variability for the monthly weights of the Fi and Fs generations of the Berkshire 
X Duroc-Jersey cross. The solid line represents curve and fitted straight line for the F2 generation, the 
dotted line the curve for the Fi generation, and the broken line the fitted straight line for the Fi generation 
Table VIII .—Variability of the F x and F 2 generations. 
Age. 
Fi 
F* 
Num¬ 
ber of 
Indi¬ 
viduals. 
Mean 
weight. 
Standard 
deviation. 
Coeffi¬ 
cient of 
varia¬ 
bility. 
Num¬ 
ber of 
indi¬ 
viduals. 
Mean 
weight. 
Standard 
deviation. 
Coeffi¬ 
cient of 
varia¬ 
bility. 
Pounds. 
Pounds. 
Birth. 
13 
2. 46 
O. 498 
20.3 
136 
2.4 
0.547 
22. 77 
One month. 
20 
13.2 
2. 36 
17. 88 
102 
IO. 07 
2. 62 
26. 02 
Two months... 
20 
25-65 
6.55 
25 - 54 
83 
18. 89 
5 *o 
26. 47 
Three months. 
19 
35-05 
8.79 
25.08 
56 
32.88 
10. 04 
30 . 54 
Four months. 
18 
47 - 72 
II. 89 
24. 92 
55 
46.29 
15 - 52 
33 - 53 
Five months. 
17 
61.94 
17. 14 
27. 67 
5 i 
64.71 
20.31 
31-39 
26550—23- 
