Rachel Alexandra, reigning Horse of the Year, turned in her first work since her second straight loss in the La Troienne on April 30, covering an easy half mile on :52 flat at Churchill Downs.

Jockey Shaun Bridgmohan, often used by trainer Steve Asmussen, was aboard for the work in place of regular exercise rider Dom Terry, who appears to have been replaced. Using Bridgmohan added more fuel to the speculation that regular jockey Calvin Borel could be replaced aboard Rachel Alexandra, who lost the New Orleans Ladies by under a length and the La Troienne by a head. We'll have more on the status of all of Rachel's riders as information becomes available.

Also on the worktab Monday at Churchill Downs was stablemate Kensei, who breezed a half in :48.80. The Jim Dandy winner was off the board in the Churchill Downs Stakes on the Derby undercard last time out.

Whitney winner Bullsbay, who was last in the Alysheba in his first start of 2010, breezed a half in :49.20 at Fair Hills.