For some it was just business. For others the final feeder pig auction at the Sioux City stockyards was one last chance to linger in the sale barn and joke with old friends.

Richard Larock, a University Professor of chemistry at Iowa State University, is developing plastics made from corn and soybean oils that will be used to build hog feeders. The feeders could be on ...

Richard Larock, a University professor of chemistry at Iowa State University, is developing plastics made from corn and soybean oils that will be used to build hog feeders. The feeders could be on ...