The owner of Kentucky Derby contender Uncle Mo says he’ll decide no later than tomorrow morning at 9:30 whether his colt will run in the Kentucky Derby.Uncle Mo, the 9-2 second favorite in the Derby, has been hampered by gastrointestinal inflammation but was thought to be improving.Owner Mike Repole says he’s having the horse checked out by three veterinarians, and trainer Todd Pletcher will make the final call on whether he’ll run Saturday. Uncle Mo was undefeated as a two-year-old but finished third in last month’s Wood Memorial at Aqueduct Park.