For anyone who cares deeply about horse racing, The First Saturday in May is not a cryptic calendar reference, but the year’s most anticipated red-letter day. It’s the annual running of the Kentucky Derby, only the first of American racing’s Triple Crown but more storied than any other equine contest.
Directors John and Brad Hennegan set out the statistics at the start of their documentary, focused on the 2006 Derby. Of the 40,000 thoroughbred horses in the United States, 23,000 will make it onto a racetrack. Only 20 of them will bolt onto the track . . .