I don't hatch on a massive scale but I do keep records. Over three years the male/female ratio has come out at almost exactly 50/50/. One thing I do know is that if you're doing it small scale it's a lot of work for not much return. I don't think you'll find it financially worth it unless you up the ante a bit. Say you set 96 eggs in your two incubators. Say you get 85% fertility, (could be worse), which leaves you with 81 viable eggs. 80% hatch rate would be good, which drops your number down to 64(if you can achieve 80%, you might well not). 32 will be cockerels which you'll have to cull as soon as you can sex them or you'll have a feed bill like a small country. Leaves you with 32 if they all survive which you've got to feed and house for several months. It's going to cost 8 or 10 quid a bird in feed to rear them So just in feed they're going to have cost you 300 quid plus other costs plus a lot of time. You sell them(if you can, might take a while), for 15 quid each giving you 480 quid. Deduct your costs. Is it worth it?