ARCADIA, Calif. – Bolt d’Oro has been taking it fairly easy since the Breeders’ Cup, but soon he and the rest of the 3-year-old class of 2018 at Santa Anita will begin their serious preparations toward the May 5 Kentucky Derby, which locally based horses have won four times in the last six years, with California Chrome, Nyquist, I’ll Have Another, and, of course, Triple Crown winner American Pharoah.