DAIRY, SEED IMPROVEMENT, STOCK BREEDERS MEETINGS. 225 



co£rr/c/£NT3 

 o s ^ § § I 



Fig. I. Diagram showing the inbreeding curves for a random sam- 

 ple of the general population of American Jersey bulls. The two heavy 

 lines give the upper and lower limiting values for the successive mean 

 inbreeding coefficients. The true value of the curve lies 'Somewhere 

 in the ruled area between these heavy lines. For comparison the curves 

 for continued brother x sister (B x S), parent x offspring (P x O), 

 and first cousin x first cousin breeding are included. O x C denotes 

 single cousin matings, and O x C double cousin matings. 



IS 



