By Ryan Owens
Special to Poultry Times
COLUMBIA, Mo. — In a chance discussion with a poultry farmer in 2009, Shawn Xu was shocked to learn about the vast amounts of propane used to heat turkey and chicken facilities. Xu, an associate research professor of civil and environmental engineering at the University of Missouri, had worked prolifically with ground source heat pumps and geothermal energy — including serving as an energy adviser during construction for the 2008 Summer Olympics in Beijing — and decided then and there to shift his focus to agriculture. He first devised a geothermal system. . .