For the first time in history, a racing program devoted exclusively to Pennsylvania-breds will be presented at Philadelphia Park. Called "Pennsylvania's Day at the Races," the 10-race lineup scheduled for June 2 will offer $400,000 in purses."What we'll be showcasing is the best of the local product," said Mark McDermott, executive secretary of the Pennsylvania Horse Breeders Association, which is based in Kennett Square. "We hope to build on this in the future."Funding for the state-bred program came from a pari-mutuel tax rebate approval by Gov. Tom Ridge for the 2001 budget. It's part of the $5 million appropriated for Pennsylvania's Thoroughbred industry.Plans call for the day to feature five $50,000 stakes and a $30,000 stakes, plus four starter handicap events. The breeders' association intends to distribute more information to horsemen both at Philadelphia Park and Penn National.