I cracked open this three yolked egg just now that was laid by a Brown Leghorn who's been laying 2 weeks and is 20 weeks old in 2 days.
She was in and out of the nest box calling out like she laid an egg about 5 times. Finally it was done. There was a bloody smear on part of the shell and it's the biggest egg yet, others have been small.
I've heard of a double yolk but never a triple.
Have you?