Halo is still exerting an influence on four continents through just two sons.
Juvenile racing has held a controversial place in American racing since the late 1800s.
For whatever Vertigineux lacked as a racehorse, she has more than made up for as a broodmare. The first three foals produced by the daughter of Kris S. have all become stakes winners, including Zenyatta.
The late John M.S. Finney once compared the science of Thoroughbred breeding with Albert Einstein's theory of relativity. "Where E represents equine investment," Finney said, "M represents money, and C represents confusion--E equals MC squared."
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