10 May, 1918.] Hereditary Unsoundness in Horses. 



291 



FAMILY 16. 



16, not examined 16 •!, founfl 4 



16 -2, SIDKBOXE, 4 

 16-3, SIDEBONE, 4 

 16-4, SIDEBONE, 4 

 16 -5, SIDEBONE, 3 

 16-6, SIDEBONE, 4 

 16-7, dam of 28 0332, sidebos 



Only the unsoundnesses, sidebone and ringbone, are taken into con- 

 sideration. "While other defects are shown in the tables, the horses are 

 regarded as sound, inasmuch as they are not affected with sidebone or 

 ringbone. 



The figure following the condition of the horse indicates the age at 

 time of examination, and the term " Sound D.A.P." indicates that though 

 sound a certificate was refused on the ground of disapproval. 



A Consideration of the Families. 

 Family 1. In this family 815 descendants have been examined, and 

 172, or 21.1 per cent., were unsound. 



Table showing summary of unsoundness. 



FAMILY 1. 



Sub-families 1.7, 1.02, 1.07, 1.09, and 1.002 do not show a large 

 amount of unsoundness. If pedigrees could be traced on the dam's side 

 it would probably be found that sound blood had been introduced 

 through them. An effort has been made to do this, but the pedigrees 

 only go back to horses which cannot be identified as being in these 

 tables, or of which there is no record. 



None of the sons of 1 was examined, but twenty-three grandsons 

 were, and they showed 52 per cent, of unsoundness — practically all of 

 this is seen in the sons of 1.1. 



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