4i 



2Zi 315 



403 49J K^ 67.5 76.3 85J 943 lOiS U2.5 

 WINTER EGG PRODUCTION 



Fig. 83. Diagram of pedigree line D61D168. The significance of lines 

 is the same as in Figs. 81 and 82, except that the mutant line is double 

 cross hatched. For the sake of simplicity E495 and the daughters of 

 D31 are omitted in the 1910-11 generation. 



