Raven's Pass, winner of the 2008 Breeders' Cup Classic, is taking a six-week hiatus from stud duty at Darley's Kildangan Stud in Ireland after undergoing colic surgery Tuesday night, according to a Darley announcement. His first foals were born this year. * In other Darley news, Sheikh Mohammed al-Maktoum has pensioned Quest for Fame from stud duty in Australia, according to the Racing Post.