683 Journal of Agriculture, Victoria. [11 Nov., 1918. 



The next family worthy of comment is that of 7.311004. Forty-seven 

 descendants were examined, and six, or 12.7 per cent., were unsound. A 

 large number of mature horses were examined, and if unsoundness was 

 a dominant factor on the sire's side, it should have appeared more fre- 

 quently in them. The inference is that the line is sound, and the intro- 

 duction of unsoundness is, no doubt, due to other blood. A search of 

 pedigrees shows that — 



7.31100404 was from a mare by a grandson of 22, of an unsound 

 line, and already shown as a relation of 1 ; the granddam was 

 by 4.13, of tainted line. 

 7.311004003 was from a mare by a son of 9.51, an unsound line, re- 

 ferred to above. 

 7.311004005 was from a mare by 3,153, sound as a three-year-old, 

 but of unsound family, and whose only son examined was un- 

 sound. 

 7.311004008 was from a mare by 4.12 already referred to; the 



granddam was by 22. 

 7.31100461 was from a mare by 3.101, of unsound line, and 

 whose only son examined was unsound; granddam was by son 

 of 1. 

 7.31100467 was from a mare by 7.31104, and the granddam by a son 

 of 3. 



There is, therefore, sufficient reason for unsoundness appearing in these 

 members. 



The remaining descendants of 7.311 show 10 per cent, unsoundness 

 in the 74 members examined. The dams of these unsound ones which 

 can be traced show as follows : — 



The dam of 7.31100811 was by 7.231. 



The dam of 7.311008102 was''by 4.42111; the granddam by 4.1222. 



The dam of 7.31100945 was by 9.312; the granddam by a grandson 



of 1. 

 The dam of 7.31100909 was by a son of 3.1. 

 The dam of 7.311000142 was by a son of 6a; the granddam by 



4.42111. 

 The dam of 7.311000143 was by 1.0541. 



Unsoundness runs through most of these lines, and its appearance in 

 these horses is not surprising. 



Passing now to a consideration of the descendants of 7.312 to 7.36, 

 12 per cent, unsoundness is recorded, and that the dams are responsible 

 can be shown in the following cases. 



The descendants of 7.312 were all sound. 



The descendants of 7,313 were sound with two exceptions, viz., 

 7,31331, which was from a mare by a grandson of 1, and 7.31332, whose 

 dam's pedigree is incomplete. 



The unsound descendant of 7.315 was from a mare by a grandson of 

 1 ; the granddam was by 1, 



7.331133 was from a mare by 7.24, an unsound horse; the grand- 

 dam by 1.33 ; the great-granddam by 38. 



7.4 shows 20 per cent, unsoundness in the five generations recorded. 

 Tl at this was not a dominant factor on the sire's side may be reasoned 



