I strongly believe that the diet of chickens effects their eggs nutritionally for us humans. I doubt no corn is the issue... but if you have an allergy it maybe effecting the eggs... Also bacteria as mentioned.
Feed studies indicate what chickens eat effect taste, look of yolk, consistency of yolk, egg shell hardness... governments do this research around the globe to find cheap ways to feed chickens. I am pretty sure it is also why health data on eating eggs is so massively different between the East and West... birds are eating different feed.
Take a look at what they have been eating, get tested for allergies... if your okay then I would look at bacteria control options.
Feed studies indicate what chickens eat effect taste, look of yolk, consistency of yolk, egg shell hardness... governments do this research around the globe to find cheap ways to feed chickens. I am pretty sure it is also why health data on eating eggs is so massively different between the East and West... birds are eating different feed.
Take a look at what they have been eating, get tested for allergies... if your okay then I would look at bacteria control options.