I've incubated 18 eggs from my flock this year, and had 100% fertility. I knew my roosters were doing a good job, and started selling the hatching eggs on eBay. Of the two people I've heard back from so far, both had 100% fertility, even with shipped eggs. This is the email I just got, that makes me proud of my flock: You sent me 14 eggs.1 got broken while turning(dropped). Your roosters sure dont need any viagra. ALL 13 HATCHED!!!! 100% hatch man and this is my first try!I am up to my eyeballs in chicks. I am 110% satisfied. Give the roosters a high five for me and a "YOU ARE THE MAN" shout out. Also you get a high five as an excellent seller!!! I'll shut up now, I'm just really pleased with that kind of feedback on my big flock 'o mutts.