I’m sure some of it depends on the species of bird, but I still don’t get it.
In: Biology
On the flip side from some of the other comments, eggs can continue to survive without heat for a decent period of time depending on the age of the embryo.
We had an incubator when I was a kid- used it yearly. We had several hundreds chickens.
One year the power went out about 2.5 days prior to the hatching date. We got the power back on and all the eggs hatched- no issues even though they were room temp for at least 24-36 hours.
Having inconsistent heat and humidity prior to the “almost hatched” stage will result in a lot of issues with thyroid, death, and a bunch of limb deformities.
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