15.33%. That's the coefficient of relatedness between Frankel and Chrysanthemum, the first mare scanned in foal to the champion racehorse during his first season at stud. As a point of comparison, first cousins are 12.5% related and half siblings are 25% related. Chrysanthemum, owned by the Coolmore team of Tabor, Magnier, and Smith, won a pair of group III races...
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There are few topics in the world of pedigree theory—and for that matter in the Thoroughbred community as a whole—that are more emotive than the subject of inbreeding. On one hand, inbreeding, and what is perceived as a consequential decline in genetic variety, is blamed for all manner of ills including a supposed decline in soundness. On the other, it has been...
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