I don't know where this would go under topics but this looked like the best spot. This is just something I was thinking about this morning and never gave it any thought before that. If a rooster is in with the hens, do you assume every egg is fertile? I see fertile eggs for sale and wonder how they seller knows for sure unless there is some kind of artificial insemination for eggs. How do we know the rooster services the hens for every egg? I can't imagine.