How long does a hen stay fertile after the rooster is gone?

If the rooster in a flock dies, or is removed, the hen will continue to produce fertile eggs for up to 4 weeks, depending on the breed. This is because there are sperm storage tubules (SSTs or often described ‘sperm nests’) in the oviduct of the hen that collect and store sperm for later fertilization of eggs. These SSTs provide a specific micro–environment to sustain sperm survival and fertilizing potential even after the male is not available.