Delta Downs has made changes to the purses of its two biggest stakes as part of a 38-race, $4 million schedule released Tuesday. The Vinton, La., track has trimmed the purse of its richest race, the Grade 3 Delta Jackpot, from $1 million to $750,000, and boosted the value of the Grade 3 Delta Princess from $300,000 to $500,000. Both races are for 2-year-olds, and will be held Dec. 5.