The “X Factor” or Large Heart Gene

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The “X Factor” or Large Heart Gene – Thumbs Down

How did this idea get started? After the death of Secretariat in October, 1989, a necropsy was performed on the great champion by the University of Kentucky veterinarian, Dr. Thomas Swerczek. One of Swerczek’s findings was that, by his estimation, based on visual examination only and from his long record doing necropsies, Secretariat’s heart was roughly twice the size of the normal Thoroughbred heart, in fact twice the size of the heart of Secretariat’s great sire, Bold Ruler.

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