Before the availability of commercial species-specific feeds, how did chickens feed themselves? By eating bugs/beetles & scratching around behind the cows, picking out the undigested corn kernels from their manure. Worked then, should work now.I think in the US that there has been a lot of discussion in recent years about whether or not GMO feeds are safe, better, or worse than non-GMO ingredients. Many consumers are uninformed or perhaps over-informed by media and internet sites. Whether supported by science or not (right or wrong), many people like to think that opting for corn-free/GMO free feed is somehow safer and healthier for their hens and therefore for their families as consumers of the meat and eggs.