Meanwhile a recent expose on the mistreatment of retired racehorses has fueled anti-racing sentiment in Australia. Activists have this year been urging the public to say "Nup to the Cup".
Six racehorses have died as a result of the Melbourne Cup since 2013, and the Coalition for the Protection of Racehorses found 122 horses had died on Australian tracks in one year.
Elio Celotto is the campaign director with the Coalition for the Protection of Racehorses. He talks to Lisa Owen.