Every "fart" egg that I have got from the hens has had a yolk in it. The first egg a hen lays usually is very small, but it isn't nearly the size of a fart egg.
By the way: A "Fart Egg": is an egg that is so small that the people on Back yard chickens call a "Fart Egg", because it is so small compared to the other eggs and was said that it was laid when the hen farted, that the hen wasn't even trying to push the egg out, that it just farted out.
By the way: A "Fart Egg": is an egg that is so small that the people on Back yard chickens call a "Fart Egg", because it is so small compared to the other eggs and was said that it was laid when the hen farted, that the hen wasn't even trying to push the egg out, that it just farted out.