I cracked 3 little pekin eggs into the pan to make scrambled eggs for lunch today, and one of them looked like pictures I have seen of fertile eggs with the wee halo around the spot. It was Polly, my top chook's egg. They are running with two teenage (12wk) light sussex cockerals which my pekin girls hatched for me 12 weeks ago. I did not think that they would be fertile yet, they are not crowing yet and I haven't seen any treading. The other thing is of course that the pekins are tiny in comparison and if one of them did try to tread them I am sure they would squash her completely! Has anyone had experience of large foul cock's over bantam hens, or of how soon boys become fertile. could I have just been mistaken?