10 May, 1919.] Hereditary Un.soundriess in Horses. 



307 



sound, consequently soundness appears dominant in his progeny. Follow- 

 ing the line through 9.3127, we find that fifteen of his sons, i.e., grand- 

 sons of 9.312, were examined, and that seven of them, or 60 per cent., 

 were unsound, and as most of the sound ones were not of mature age, 

 unsoundness is the predominant factor in this generation. 9.3127 was 

 not examined, and he may have been unsound; it is more than likely 

 that he was, for he is carrying the unsound blood of 9.31, and was from 

 a mare by 38, previously referred to as appearing frequently in unsound 

 pedigrees. Therefore we may assume that the combination of blood 

 has caused unsoundness to prevail in this progeny. Only one in tlje 

 generation was aged and sound at examination, viz., 9.312705, and as he 

 was from a mare by 7.41 of very sound line, the factor for soundness 

 would again become dominant. 



Through the branch 9.5, 20 per cent, unsoundness is shown. All of 

 this is in the progeny of 9.51, which was from a mare by 1 — the sire of 

 an unsound family. A considerable amount of the unsoundness is 

 counteracted through 9.512, which was hy 2.5, of sound blood, and so 

 mature sons are found sound, but when again meeting unsound blood, as 

 did 9.5122, whose granddam was by 3 and 9.5127, whose dam was 

 9.3102, the factor predominates, and unsoundness results. 



9.52 appears as a sound line, but, as the pedigree of the dams cannot 

 be traced, it is impossible to say in which generation soundness appeared. 



9-2, not 

 exam- 

 ined 



• 9-11, not 

 examined 

 9 -12, not 

 examined 



f 9-21, 

 \ sound 

 I D.A.P., a 



9-22. 

 l_ sound, a 



(9-111, sound, 6 

 I 9-112, sound, 4 

 r9-121, not ex- 

 amined— 



9-122, sound, 3 

 9-123, sound, 4 

 9-124, sound, 3 

 9-125, sound, 6 

 9-126, sound, a 

 9-128, sound, 5 

 9-1201, not ex- 

 amined — 



9-1202, not ex- 

 amined 

 9-1203, not ex- 

 amined 

 9-127, sidebone, 4 

 9-12S, ringbone, 6 

 I 9-1204, not ex- 

 L amined 



-9-211, sound, 5 



FAMILY 9. 



9 1213, sound, 5 

 9 1214, sound, 4 

 9 1216, sound, 5 

 9 1217, sound, 3 

 9 121 8, sound, 5 

 9-1219, sound, 5 

 9-12101, sound, 3 

 9-12102, sound, 3 

 9-1210:*, sound, 3 

 9-12105, sound, 4 

 9-12106, sound, 3 

 9-12107, sound, 3 

 9 -12108, sound, 3 

 9-12109, sound, 4 

 9-1211, Sidebone, 5 

 9-1212, sidebone, 3 

 9-1215, sidebone, 4 

 1-12104, sound 

 D.A.P., 3 



I 9-12011, sound, 4 

 9-12012, sound, 3 

 -9 12021, sound, 4 



-9 12031, sound, 4 



-9-12041, not ex- 

 amined 



—9-120411, not ex- 

 amined 



-9 1204111, sidebone 



