Incubation temperature? Need help

[PoultreeKing]

I personally aim for 37.7C, but don't mind too much if it is a fraction higher or lower. I have had the odd elusive 100% hatch rate too.

The way I see it is, hens constantly shuffle their eggs around under them, moving them to cooler and hotter spots, so I'd say anything consistent and as close as possible to the "perfect" temperature is good. From what I read and learned, incorrect temperature can affect hatching in that the chicks may come a bit early if too hot and up to a day late if a degree celsius under the recommended 37.7/8C Eggs failing to develop, embryo mortality and eggs failing to hatch can be due to number of other causes, from the breeder flock's diet, to the age of the eggs and more. If you are interested I've written an article on the topic here:

https://www.backyardchickens.com/articles/egg-failure-to-hatch-diagnosing-incubation-problems.67011/

There is another article linked to the from the bottom of this one, discussing hatching eggs.

Thanks man