The Birb King
Bird is the word
Why don't you keep any males it would be easier than buying new eggs every timeNone of my hens are related—I keep no males, so each hatch starts when I swap a clutch of empties for fertile eggs I buy online. I would bet it's environmental—big space, lots of cover, no males, and I basically leave them be except to clean up and sneak a camera in there once in a while.