MAINE AGRICULTURAL EXPERIMENT STATION. 



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Fig. I. Diagram showing the inbreeding curves for a random sample 

 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 broth- 

 er X sister (B X S), parent X oflfspring (P X O), and first 

 cousin X first cousin breeding are included. O X C denotes 

 single cousin matings, and C X C^ double cousin matings. 



