274 



E. H. HARPER. 



Now leaving out very young and very old sires, the cases in 

 which dams were mated with sires 5-13 years of age are given, 

 first for colts and then for fillies. 



TABLE IX. 



COLTS. SIRES 5-13 YEARS OLD. 



When the dams are grouped as above from young to old the 

 prepotency of the dam runs along in a series above shown 49, 

 51, 55, 62, 51, apparently showing an optimum period of pre- 

 potency somewhere in middle age. In Table X. dams mated 

 with sires of 8-10, a more homogeneous group, are considered. 



TABLE X. 

 COLTS. SIRES 8-10 YEARS OLD. 



Here the dam's prepotency makes a series 38, 53, 66, 63, 

 47, the maximum being in middle age. In the next table the 

 results for fillies are given. 



TABLE XI. 

 FILLIES. SIRES 5-13 YEARS OLD. 







It may be noted that in the last table the prepotency of the 

 dam does not show a regular increase nor run to so high a point 

 at any age as in the table of colts. On the whole, however, there 

 is a rise in the prepotency of the dam with age. 



In the previous tables dams were taken of all ages. In the 

 next are given all the cases where very young dams were mated 

 with very young sires. 



