94 Dynamic Evolution 



and to the breeding ranks later reproduce 

 at a higher average age than those which go 

 directly into the breeding ranks, we have the 

 normal condition indicating that the age of 

 the dam has nothing to do with the qualities 

 of her sons as performers. The ages of the 

 dams with records are very uniform, but the 

 dams without records range from four to 

 fifteen. A four-year-old dam probably 

 never wore harness, or if so, to only a 

 small extent as a two-year-old. Fillies are 

 often trained at one, two, and three years 

 of age, but such fillies ordinarily go first to 

 the race track. A four-year-old dam (bred 

 at three) cannot possibly have a material 

 amount of dynamic development acquired 

 after sexual maturity, hence, if anything she 

 acquired before she was bred was of advan- 

 tage to her son it must be that which she 

 acquired in her immature stage. 

 Dams of 2 : 10 Mares 



9 Dams with records average age: 7.89 years 



48 Dams without records average age: 10.63 years 



Here we have a greater number of dams 



