Rooster has been gone for over 1 month! Hens have not laid any eggs for that month!! Hens are 1 1/2 years to 2 years old. Last 4 days hens have been laying again. Is there any chance that they could be fertile ??? I opened up the 4th egg, it looked like it had the bulls eye, or is that just me hoping? How long can the sperm stay with the egg in the hen and still be fertile???