I wouldn't use this for a research paper, but I think the Kentucky Derby was shortened because it simply was too much for the horse to run that long. There is a bigger risk of death to horses if they are forced to sprint for a longer amount of time, and I'll use Barbaro as an example. Barbaro was a horse who competed in the Kentucky Derby who shattered his leg two weeks after the Derby which lead to death. Although this occurred after the shortening of the race (2006 I believe), the Derby is still a risk of injury or even death in some cases.
--14-year-old horse freak :)
I hope I hinted an idea?
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