Mage (8), with Javier Castellano aboard, wins the 149th running of the Kentucky Derby horse race at Churchill Downs Saturday, May 6, 2023, in Louisville, Ky. (AP Photo/Charlie Riedel) 
Horses come through the first turn during the 149th running of the Kentucky Derby horse race at Churchill Downs Saturday, May 6, 2023, in Louisville, Ky. (AP Photo/Julio Cortez) 
Here Mi Song is taken by an equine ambulance after the 10th horse race at Churchill Downs Saturday, May 6, 2023, in Louisville, Ky. (AP Photo/Charlie Riedel)
What is horse racing doing to prevent catastrophic injuries?
