It is true though. Up until this year I raised gamefowl. At first I used the standard wet incubation for my gamefowl eggs and had horrible hatch rates. Finally I switched to the dry method and started getting high hatched rates. This year I got a pair of Dominiques and started hatching eggs from them in the incubator with my gamefowl. All my gamefowl eggs were hatching fine but all the dominique chicks were coming out all deformed. I thought the deformities were due to genetic defects, but after talking to an expert, it was suggested I use different settings just for the Dom eggs. When one of my game hens went broody I stuck a dozen eggs under her and she hatched all 12. Not a single one had a defect. This proved that the deformities were connected to my incubation settings. So the expert was right about different breeds requiring different settings. Sebright eggs are a lot smaller then normal chicken eggs ( more like quail eggs) and so I think it possible they might need different settings as well.