go Dynamic Evolution 



reason founded upon the belief of breeders 

 that the strain of racing "saps the vitality" 

 of horses and injures their offspring, with 

 the result that the sons of horses sent to the 

 race track are usually gelded until those 

 horses prove their value as sires. As a horse 

 of popular breeding is worth more in the 

 stud than on the track, this does not apply to 

 the same extent to the horses never raced. 



Sires of 2:10 Mares 



41 Sires with records average age: 9.8 years 



25 Sires with no records average age: 10.8 years 



66 Sires of Mares average age: 10.16 years 



Sires of 2 : 10 Geldings 



35 Sires with records average age: 8. II years 



21 Sires without records average age: 10.76 years 



56 Sires of Geldings average age: 9. 1 1 years 



These sires range from 3 to 23 years of age, 

 with no material difference for sires with or 

 without records, or for sires of mares or 

 geldings. Fifteen of the sires without records 

 are six or less years of age, a fact which indi- 

 cates that the age of the sire has nothing to do 



