How many eggs does a hen lay when she is sitting?

Answer 1

An individual hen will go"broody" and will gather a clutch of eggs to brood. These will not always be her own eggs. She will steal them from other hens by rolling them into the nest she has chosen. Unless the hen is broody she will lay her egg and leave the nest announcing loudly to the rest of the flock what she has accomplished. Hens can go broody whether there is a rooster in the flock or not, so no, not just fertile eggs trigger the brooding instinct.

Answer 2

A hen will only lay one egg per day. If you mean how many eggs will a broody hen lay once she starts to brood a clutch of eggs the answer is none. Once the hen going into brood her egg laying days are over until the clutch she has are hatched and gone.

Answer 3

Hens typically stop laying eggs when they are sitting on a nest to incubate them. They focus on keeping the eggs warm and safe rather than continuing to lay more eggs.