It sounds like the embryo's just might not be strong enough to survive. What are you feeding your birds? Do they get to free range and eat bugs/grasses? I assume they're all healthy and active?
Not to try to cut in or thread steal, but,
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So..does it hurt to have slightly lower temps the last 2-3 days of incubation? I've got a hatch that should be hatching tomorrow or Monday and since I took the turner out the temps have been a little low..I've been trying to raise 'em back up though. Do you think this is okay? I'm so nervous about this hatch because over 50% of the eggs I bought and they were shipped from PA.