Fertile eggs not developing - no veining

[Arinissa]

Hello

Has two batches of hatching eggs not develop at all. In incubators , i think they are calibrated to 37.5 although one is being problematic. On candling no veins or any development. After 22 days first batch opened to reveal thick yolks but nothing else. Second batch in just under a week and same - nothing! Though candler is a bit shit. Any suggestions? Ty!

Incubator set to 37.5 seems to be about 40% humidity trying to raise this

Ty

 

[featheredplanets]

If they’re definitely fertile, non developing eggs are usually caused by temperature spikes very early on or eggs being stored too long before incubation. Have several thermometers and hygrometers to be certain of temp and humidity and for best hatch rates try to use eggs no older than 10 days.

 

[Arinissa]

How do people keep the humidity constant? It seems to go up and down with water in the incubator.

 

[featheredplanets]

Adding water for humidity isn’t a must. A lot of the time, you don’t need any water for additional humidity until lockdown. You may find these helpful! https://www.backyardchickens.com/ar...h-eggs-using-the-dry-incubation-method.47694/
https://www.backyardchickens.com/ar...-eggs-just-21-days-from-egg-to-chicken.47696/

 

[Heffalump]

Are you sure the eggs are fertile? Not just believed to be fertile?

 

[Arinissa]

Pretty sure - and for 20 of them not to be from 3 different sources....