My job brings me in contact with lots of people. Today we were with a gentleman in his 70's. He was telling how his family on their farm used to provide eggs for a local hatchery. Their farm had a high hatch rate and one day the hatchery asked them what they did they helped have such a high hatch rate. Well long story short, according to this guy, wheat added to feed makes a rooster more fertile. I don't know if there is anything to it but this guy swore by it.