John Tuthill wouldn't be the type to shout from the rooftops about the racetrack successes of the graduates of his Owenstown Stud. But, then again, he doesn't have to--the horses have done the talking themselves. From a band of about 15 broodmares of his own, Tuthill bred two winners of the G1 Queen Elizabeth S. in the space of five years: Excelebration (Ire) (Exceed and Excel {Aus}) in the Derrick Smith silks in 2012 and the filly Persuasive (Ire) (Dark Angel {Ire}) for Cheveley Park Stud in 2017. He also...