I am going to ask what to some may be a dumb question, but I am just a beginner, so here is my question. I see a lot of ads where people want to buy fertilized eggs or are selling fertilized eggs. How do you know if the eggs are fertilized? Are they fertilized before they are laid, or after? If before, how long does the hen stay fertil? Does the rooster have to get with her every time she lays an egg?