We have one remaining hen from a batch of 5 after a tumultuous summer in 2008. Two were killed by a neighbor dog when they wandered into his yard and we donated two roosters because we live in the city and there were literally too many roosters in the hen house. Anyhow, we're ready to expand the flock. My questions are: 1. Can eggs be introduced to a hen at any time or am I to wait for some specific time in her development? 2. If I introduce fertilized eggs to her and she won't sit on them, what are my options? I have more questions, but let's just get the two major ones out of the way. TIA.