It's unclear exactly when the tradition started, but we know who to thank. Louie Meyer was a three-time winner of the race who hailed from Queens, New York. His mother recommended he drink buttermilk on hot days.

When Dean Foods decided last month to end procurement contracts with 27 of its 28 Hoosier farmers, dairy experts worried about the ramifications. Some farmers were lucky enough to find new markets for their milk, but others were not

The new plant will process Walmart's Great Value milk distributed to stores in Indiana, Illinois, Michigan, Ohio and Kentucky.

The contracts were canceled, in part, because Dean Foods lost a deal with Walmart, which means it doesn't need to buy as much milk from producers.

Construction of the 250,000-square-foot plant at Brandenberger Farm is scheduled to begin this summer.