Yeah, like I wouldn't worry about the fertility if you're having development in most. If they developed but die off, it sounds like an incubator problem, not fertility problems
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Congrats on a 100% hatch.I have Rcoms too!I do watch the temperatures though with additional thermometers and I have had to adjust them. I incubate at 30% or less humidity and 99.7'F. I just hatched 20 out of 20 Bresse chicks.