Joining this thread a few years late.
We have two hens about 6 months old. They began laying 3 weeks ago. Five days ago one of them started laying smelly eggs. I can smell it when I crack the shell. It's not particularly strong, but I can definitely smell it. It's got what smells like a sulphur edge to it...but. I have been eating them poached, on toast. I have, so far, suffered no ill effects, but then I don't get sick easily.
It isn't hot here now. It's late winter in Auckland. Nights around 8C and the days not above 18C. "Winter" here only last about 6 weeks anyway.....and the nights may be close to zero and the days around 15C for a month or so. Even in the summer it rarely goes above 30C. It's a very comfortable, moderate climate through almost all of the year.
I'd love to know what the smelly egg thing is and what causes it...and how to stop it, if possible.