I have really enjoyed all the response to my question.
Thank you everybody!
This answer is very interesting to me! Our breeders have unlimited access to food and water (unless one runs out - of course) so I don't think that would be a problem. Also, Ron's comment about 100% hatches is intriguing. The dog ate too many of our chicks from the 100% hatch we had - so I don't know how that would have turned out. Most of our other hatches have been much less due to shipped eggs.
Here is the real reason for the question. We have been trying and trying to get Brabanters. Brabanters are VERY rare and hard to find good stock. So we ordered eggs. We knew that as a breed it was cockerel heavy but it is very surprising to see that in action. We have a Brabanter cock and I recently hatched a pile of EE's off of him. The EE hatch was pretty good. Maybe 2 out 16 eggs didn't hatch. Anyway, the amount of boys off of that hatch was tremendous. I sold all but 6. My remaining 6 are all boys! I've talked to 2 customers and now know of a couple pullets, they each have 1 pullet from their straight run purchases.
Poor people. Poor me.
I offer a pullet protection policy because I have a pen that I can house all the returned cockerels and then get rid of them. They only get a credit towards the purchase of sexed birds (which obviously cost much more than straight run) and sometimes they have to wait. Since this hatch I will be rethinking my strategy. Biosecurity is not a problem because I've got the space and the cockerels can go in a completely separate part of the yard. It's just that I kept 6 birds and have nothing to offer ...
Since that Brabanter EE hatch, I have hatched a bunch of Blue Wheaten EE's (same hens, different cock). I'm interested in the boy/girl ratio. If it is still bad, I may quit gathering eggs from those hens!