IMPROVING EGG PRODUCTION BY BREEDING. 



220 



Fig 74. Diagrams showing the results of matings : A, a Type i male ; 

 B, a Type 2 male ; and C, a Type 3 male, with high laying hens. In 

 these and the following diagrams, a solid black hen means a high winter 

 producer, a cross-hatched hen a low winter producer, and a clear white 

 hen a zero winter producer. 



