I would welcome that type of change in Iowa! We, for the most part, have convinced all the bow hunters, that hunt the same private property, to shoot only older bucks or does, but when the shotgun season arrives, it's a different story. I believe it would be hard to convince the farm owners of the sense this would make. The farmer that owns the property I hunt on, always tells me to shoot everything I see, and take the one I want. This rule would be hard to enforce without check stations, which IMHO, isn't a bad idea either.