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A determined hen will sit on those eggs until they explode, if they don't hatch first. If you didn't mark the eggs in some way when she first started setting, go ahead and place a mark on them now, so you will have a point of reference and know whether any hens slip new eggs beneath her.
If 22 days go by since you first recall her setting and they haven't hatched, put some fertile eggs under her and she will sit there until the second batch hatches. Go ahead and remove the ones that didn't hatch
When you candle them and you can see any kind of spider looking veins coming from the broad end of the egg, you know they were fertile and have a chance of hatching. (remember you can see best if the room is totally dark and the only light is the flashlight or egg candler)
The short answer to your question is - no, the hen may not realize that her eggs are potential explosives and she will set on them way past a reasonable time for them to hatch. I have had a turkey hen set on eggs all summer long - with me rotating new eggs under her when I realized the ones she was setting on were really rank.
A determined hen will sit on those eggs until they explode, if they don't hatch first. If you didn't mark the eggs in some way when she first started setting, go ahead and place a mark on them now, so you will have a point of reference and know whether any hens slip new eggs beneath her.
If 22 days go by since you first recall her setting and they haven't hatched, put some fertile eggs under her and she will sit there until the second batch hatches. Go ahead and remove the ones that didn't hatch
When you candle them and you can see any kind of spider looking veins coming from the broad end of the egg, you know they were fertile and have a chance of hatching. (remember you can see best if the room is totally dark and the only light is the flashlight or egg candler)

The short answer to your question is - no, the hen may not realize that her eggs are potential explosives and she will set on them way past a reasonable time for them to hatch. I have had a turkey hen set on eggs all summer long - with me rotating new eggs under her when I realized the ones she was setting on were really rank.
