Feb. 17,1923 
Inheritance in Swine 
567 
underline and rear parts, but this was not uniformly true. The spots 
were all small, very few of them being over 1 square inch in extent on 
the new-born pig and most of them being not more than one-third as 
much. The red body color varied in intensity, 4 of them being described 
as sandy red, 2 as red with white bellies, and 1 as red with a sandy belly. 
Uniformly as they matured the red became lighter and, although they 
did not all come to the same shade of red then, it would be more accurate 
to describe them, when mature, as sandy hogs with numerous small 
black spots. Where not otherwise stated in this discussion, the color 
of a pig is understood to mean the color at time of birth because red 
and sandy were then most distinct. 
Eight sows and one boar (PI. 2, B) all of which were described as black- 
and-red at birth, were selected from the Fj generation for breeding pur¬ 
poses and from them were produced 151 pigs (PI. 1, J), including three 
which ceased development at such an early prenatal stage that their true 
color could not be distinguished with certainty. When classified as to 
the color of hair, without regard to the patterns in which these colors 
were arranged, the 148 F 2 pigs and the 35 back-cross pigs produced by 
breeding the Fj boar back to his own dam, gave the results shown in 
Table III. 
Table III .—Color of 148 F 2 pigs of ihe Berkshire-Duroc-Jersey-Cross 
Color. 
Number in 
Fa. 
Number in 
the back- 
cross. 
Black-and-red . T .. 
47 
19 
ftlaek-and-white r ,. T T . T . 
27 
Self red . . _ T T . _.. T ..... 
14 
14 
Tilaok-and-sandy , T -,.-. 
zi 
ft lack-red -and-white... T . 
10 
I 
ft lark-red -and -s^ndy t . T . . . , . ,... 
10 
Sandy 
7 
Sandy-and-white ,,, , .. 
7 
ft laok-sandy-and-white. 
6 
Red-and-sandy. 
3 
1 
"R ed-and-white . 
3 
\yTdte » -r. . 
3 
Total... 
148 
35 
A classification according to the presence or absence of each color 
separately gives the results presented in Table IV. 
Table IV .—Color of pigs in F 2 of the Berkshire-Duroc- Jersey-Cross , classified as to each 
color separately 
Color. 
Showing black.... 
Not showing black. 
Showing red. 
Not showing red. . 
Showing sandy. . . 
Not showing sandy 
Showing white. 
Not showing white. 
Number in 
Fa. 
Number in 
Ratio. 
the back- 
cross. 
Ill 
37 
}3:i (exact). 
f 20 
l 15 
87 
61 
44 
104 
I97 (approx.).. 
| 35 
) 
} i:2 -3 . 
{ 
56 
\i :i.6. 
/ 
92 
/ 
\ 34 
Ratio. 
(approx.) 
