Very few have tried maternal incubation. Those that have tried it have proven that they will definitely eat while incubating the eggs. It's a myth that they won't.

As far as eating after Ovy, I haven't seen it, or heard, but I'm a relative newby, being only my 2nd year breeding. I never had any of my females eat from about 4 weeks before Ovy until after laying. Not saying that it doesn't happen, but I don't know of it happening.