I have lots of people interested in buying our eggs when the time comes; however, I have a few who are worried about receiving "surprises" when they crack their eggs. How, exactly, do I ensure that my eggs will not yield chicks unless I want them to?? Must they be refrigerated asap and that takes care of the potential threat? I apologize for the (perhaps) stupid question, but I've not had a rooster till recently..he's only 10 wks now, but he'll be getting busy soon enough, so I want to be prepared! Thanks in advance!!