Jockey Jamie Theriot, who teamed with trainer Bret Calhoun for a Breeders’ Cup double in 2010, will join forces with Calhoun at Louisiana Downs on Saturday, when he rides Louies Flower in the $100,000 Prelude. The race is the local prep for the Grade 2, $400,000 Super Derby. It also is the lone open-company stakes on a card of nine restricted stakes worth a cumulative $700,000.