A couple tips on hatching bresse I wish I had been given before I tried to incubate them.
1) The eggs of pure or nearly pure birds don't have a protective bloom so be super careful with handling / candling, and perhaps look into one of the disinfectant egg sprays. (I will if I ever hatch bresse from my birds)
2) They do better with a lower initial humidity around 40-50% then up it to normal lock down levels after draw down. Evidently the eggs don't loose moisture the same way other chicken eggs do and its easy to drown them. ( I had other eggs that had been shipped in the incubator, so by pure luck I was doing a dry hatch. I marked all the air cells to track moisture loss and the bresse air cells didn't change at all until the last 3 days)
In my research I also heard that bresse are prone to egg shell quality problems and need higher levels of calcium and protein than other meat birds. I brought that up with the fellow I bought my eggs from and he told me otherwise, but all of my eggs were porous and/ or seemed VERY thin.
I hope your hatch goes well
