10 July, 1918. | Hereditary Unsoundness in Horses. 



429 



2.5 was probably sound, although in the family of his son 2.51, unsound- 

 ness predominates. This can be accounted for by the fact that 2.51 was 

 from a mare by 1.1, a very unsound sire. The other son, 2.52, apparently 

 carried the sound blood of 2.5, for of his progeny which are sound, 6 are 

 seven years old or over, and the unsound ones are tainted in nearly all 

 cases through the dams, as follows.: — 



2.525 was not examined, but his progeny is very unsound. He 

 was from a mare by 9.31, and of the seven sons of this horse 

 examined, 5 are affected with sidebone, and 2 with bog spavin ; thus 

 71 per cent, were sideboned.' Of the remainder of the progeny of 

 2.525 which can be traced through the dams — 



2.5253 was from a mare by 1.511, a sire of unsoundness. 



2.52511 was from a mare by 7.232, a sire of unsoundness. 



2.52512 was from a mare by 7.232, a sire of unsoundness. 

 Stallion 2.52023 carries the blood of 1 and 9 in his veins. 



Thus most of the unsoundness in this line can be attributed to the 

 influence of the mare. 



2.6 appears to be another sound horse, though only twelve of 

 his progeny have been examined. Only one, 2.61133, is unsound, 

 and the dam of this horse is by an unrecorded son of 3.1, already 

 noted as being unsound. The table shows that six of ih.^ remain- 

 ing members of this line were five years of age or over at examina- 

 tion, and were found sound. 



The complete tables for Family 2 are as follows : — 



