Churchill Downs, the largest and most famous horse racetrack in the world and site of the Kentucky Derby, is instituting a new "safety initiative" after a rash of thoroughbred deaths on the track, effective immediately. The new protocols were announced on Thursday after a meeting between track…

The saddle that was strapped to Seabiscuit's back when the legendary horse won his very last race in 1940 has just sold at auction for more than $100,000 ... TMZ Sports has learned. It's the saddle ridden by jockey Red Pollard at the 1940 Santa Anita Handicap -- one of the most dramatic races in…