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Some people will suffer a mild form of an allergic reaction and have minor symptoms including such things as hives. Those with a more serious reaction to onions may even have problems just breathing in the smell of onions without having an allergic reaction that can compromise their health.
Excessive amounts can cause jaundice or anemia in your hens or even death. Some claim that onions will taint the taste of your eggs as well. We can't validate that claim because we don't feed them to our chickens.