It just means he has a rooster with the hens, and if he let the hens sit on the egg, it would hatch. They don't taste any different. I suppose some might argue that they have more nutritional value, but I doubt it's much. We have chickens, and had a rooster for a while, and personally, I'm a little more comfortable eating the non-fertile eggs -- it's probably silly on my part. Hope I don't put you off the eggs -- the farm fresh eggs really are yummy! Once you have them it's hard to eat even store-bought organic eggs -- they just don't taste as good to me.