i think i well be AI ing next year too that way all my hens can run togeather and i just keep my boys in there own pensI agree, all of those eggs should be fertile. They should all hatch, unless something goes wrong. You can see ahead of time if an egg might not be as viable-- if the shell has clear spots in it (really porous) or if it's been sitting out too long, etc. So there are other variables. If you are not getting good fertility, could be too many hens, or he's just not doing a good job. I had that problem and now when I'm very serious about getting a good hatch and not a so/so one, I just AI them. Then I know everything is fertile. I also like the fact they don't have to be taken out of condition to breed to do that.