Originally Posted by WalnutHill
I've set old eggs (> 1 month) stored at room temp...FAIL
I've set shipped eggs (about 50%)
I've set refrigerated eggs (about 40%)
I've set infertile eggs from dishonest sellers (0%)
I've temperature controlled and humidity controlled eggs
I've turned eggs and not turned eggs
I've kept eggs in the dark, and eggs in the light
I've set porous eggs (work best in cabinets), bumpy eggs (no issue), pullet eggs (tend to hatch early but need less humidity than old hen eggs), eggs of different size (hatch at different times), and eggs of different breed (bantam hatch earlier than LF).
I've set turkey eggs a week ahead of chicken eggs, and same day as chicken eggs for a staggered hatch.
Set the freshest, best quality eggs of the same size and you improve your odds of success, but eggs are designed to hatch so it's likely some will as long as they are fertile and not rotten.