04/28/2006 12:00AM

First Samurai sidelined with cracked ribs


First Samurai, a leading Kentucky Derby contender until his fifth-place finish in the Blue Grass Stakes, has two cracked ribs and will be sidelined indefinitely, trainer Frank Brothers confirmed on Friday.

Brothers said the injury likely happened either in the starting gate or leaving it during the Blue Grass. He said First Samurai will remain in his barn while recuperating, and that if all went well the horse would be pointed for a summer or fall campaign.