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Racing records were collected from the United States Trotting Association public database and included: sire; gait; number of races started as a 2 year old, 3 year old, and 4 year old; races won and earnings at 2, 3, and 4 years of age; total seasons raced; cumulative lifetime starts, lifetime wins, and lifetime earnings; earnings per start; and fastest time recorded. Horses that started a race but did not earn any money were assigned nominal earnings of $1 to distinguish them from those that never started a race.

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