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I check fertility after 5 days using a flashlight and if not fertile toss them at the 10 day mark so as not to stress the hen from re-laying too quickly. If the eggs are 18 days old then you can tell right away if they are not fertile and will not have to guess. If they are infertile you also do not have to wait so if you throw them away at 10 days you've saved yourself another 8 days in the cycle for the pair to lay again, and time is valuable at this point in the season.

Just hold them up to a bright flashlight in a darkened room and if you see a clear translucent quality to the eggs with only a patch of floating dark in side (yolk) then the eggs is infertile. If the egg is so dark you can't see through it with the flashlight then it's fertile and the babies will either hatch, you might be able to feel or hear them pipping, or possibly they died at some point in the egg.

At the 5 day mark with the flashlight you can see pretty clearly the fetus, looks like a blood clot with a spiderweb network of veins surrounding it. After about 9-10 days the fetus becomes big enough to really darken the egg and you won't see hardly anything in there (a good sign).

After you raise pigeons a while you will be able to recognize after 10 or 12 days if an egg is fertile or infertile in the nest without even candling them. The fertile eggs gain a bit of weight, look more opaque, slightly darker gray. The infertile eggs remain brighter white with a clearish look to them.
 

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I usually wait till the parent birds get off the nest and ignore them, but you can run the risk of breakage and that can not be pretty. so if they have not hatched on the 25th day then they probably won't.
 
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