The Keeneland September Yearling Sale marched into its second week with continued competitive bidding as the auction's Book 4 section opened Monday in Lexington. "There is unbelievable trade here today," said consignor Peter O'Callaghan of Woods Edge Farm. "There is just a huge crowd up there. And they'd knock you down for a good horse. I'm actually not surprised it's this strong. Not with the way it started and the amount of people who have not yet got to buy horses. It was clear that trickle down effect was going...