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You say the ones you checked had a white spot. As far as I know, all eggs have a white spot. If you want to check for fertility, you need to look for the bulls eye - white spot with a white circle around it. If that's not there, maybe your roo is too old? Or maybe the eggs were too old when you started incubating them?If the eggs are fertile, but after 20 days you pull a couple and check em there was no development. Check the other 18 same no development what would cause that? Not saying they were fertile but I have hatched over 50 with the same hens/roo combo. Just set 30 but before I did checked several and all had a white spot. Temps were 99.5 humidity stayed in the upper 50's to upper 60's with a couple of readings low 70's let me know what you think.