Once a month, a big truck arrived at the farm in Grundy County, Iowa, where writer Lawn Griffiths was growing up in the 1960s. It was from Big Gain Feeds from West Union. In his book, Batting Rocks Over the Barn: An Iowa Farm Boy’s Odyssey, Griffiths tells how important the specialized livestock feeds were for the hogs, cattle, and chickens on the fa . . .