sentences:  The Twenty Acre Dairy Barn, the Dairy Horse Barn, and the Dairy Experiment Barn were all listed as contributing properties within the University of Illinois Experimental Dairy Farm Historic District when it joined the National Register of Historic Places on February 4, 1994.The barns played a broader role in the history of American agriculture, specifically in the Midwest states.The barns at the University of Illinois were part of a larger move by Agricultural Experiment Stations meant to promote round barn design, mostly on account of their "efficiency."