PLATE i 
A. —The second wild boar used in these experiments. (Courtesy of the Iowa . 
Agricultural Experiment Station.) 
B. —Two pure-bred Tam worth sows and a litter out of one of them by a wild boar. 
The pigs are about 6 weeks old. 
C. —The F t boar whose ears were not erect. Not used in breeding. Berkshire 
X Duroc-Jersey cross. 
D. —A Berkshire X Duroc-Jersey F x barrow showing the almost complete dominance 
of the Berkshire shape of ear and face. 
E. —The Duroc-Jersey sow that was the dam of all the F x breeding animals in the 
Berkshire X Duroc-Jersey cross. 
F. —Two F a individuals showing the segregation of ear shapes. Berkshire X Duroc- 
Jersey cross. 
G. —The “pompadour" Berkshire type of forehead as seen on an F 2 individual 
of the Berkshire X Duroc-Jersey cross. 
H. —An Fj barrow with exceptionally straight face. Berkshire X Duroc-Jersey 
cross. 
I. —A particularly long-faced individual. Fj generation of Berkshire X Duroc- 
Jersey cross. 
J. —Two F 3 litters of the Berkshire X Duroc-Jersey cross, showing the diversity 
of colors produced. 
