I have a hatch of Bresse going that had fair fertility but not good hatch results. Two were upside down, one pipped and died. Two were stuck in the shell. One of them has a leg issue and I do not know yet about the last two--they are working on getting out still. I suspect flock health is the issue. The Bresse are in Winters at the egg farmers place. He told me, quite proudly, that he saved money over the winter by only feeding them grain. I suspect that they need to be wormed and treated for lice and mites. They also likely need some better nutrition.
Now to figure out how to get him to do this. I may have to go out there and treat them myself.....
And 10 of 32 of them did not hatch at all.