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Note that there is not a complex genetics or breeding system in Derby Days; it is primarily determined by random chance and luck. Parents with similar traits are more likely to throw foals with those traits than parents without those traits, however there is no way to guarantee breeding results.

All that can be definitively said at this time is that valuable foals take more time to be born, and times range between one and 72 hours.

For more speculation of breeding mechanics, make sure to check out Dr. Tanner, Harse Doctor and Derby Derps.