PREPOTENCY 



553 



Besides this, these same 207 sires produced 4507 dams of 

 speed, and they produced 6691 performers (51201571 p.); so 

 that about 3 per cent of the sires have produced the sires 

 and dams of somewhere between two thirds and three quarters 

 of the total speed of the race. If we should add the produce of 

 the sires and the dams, we should have 16,536 -f 6691 = 23,227 

 apparent grandchildren of those 207 sires. This we cannot do 

 because many of those recorded as offspring of dams are also 

 recorded among the offspring of sires ; that is to say, they are 

 duplicates due to the fact that many of the 4507 dams were mated 

 with some of the 3155 sires. We cannot tell, therefore, from 

 these figures what exact proportion of the total number registered 

 may have descended from the 207 great sires. 



Distinction between sires of sires and sires of dams. Ana- 

 lyzing these 207 great sires, it was found that they were un- 

 equally divided between sires of sires and sires of dams of speed 

 as follows : 



Class i. Sires of ten or more sires of speed, but of less than 

 ten dams of speed, 9. 



Class 2. Sires of ten or more dams of speed, but of less than 

 ten sires of speed, 113. 



Class 3. Sires of ten or more sires of speed and of ten or 

 more dams of speed, 85. 



Of these three classes, i may be considered as distinctly sires of 

 sires, 2 as sires of dams, and 3 as sires of both sires and dams. 



From the table on the following page it appears that : 



1. The poorest breeding record was made in every case but 

 one by Class 2, the sires of ten or more dams but not of ten 

 or more sires. Note the ratios, lines 3, 5, 7, 8, 10, 12, 13, 15. 

 The only case in which they outdid Class i was in the ratio of 

 clams produced per stallion (15), which was clearly in excess of 

 Class i (6), which are distinctly stallion breeders (line 10). 



2. The great breeding record was made by Class 3, the 

 sires that produced both sires and dams freely. In every case 

 the ratios are higher than for any other class, whether performers, 

 sires, dams, or produce of sires or dams. 



3. Class i, sires of sires, was clearly superior to Class 2, sires 

 of dams, but in all cases inferior to Class 3, sires of both. 



