How long do you leave infertile eggs in bator

[chicksooner]

I was thinking I needed to take them out but then I thought I would leave them in until lock down to help as heat holders. They are not stinkin and were fresh from my chickens. Is it ok to leave them?

 

[Yiannisk]

I would not take the chance of living an infertile egg in the bator it can take just one night for an infertile egg to crack and pollute the incu

 

[kizanne]

I leave mine in til about day 12-15 so I can make sure they were infertile. I have noticed that some of my eggs just seem to look different. I've had eggs I thought were infertile show growth and hatch. So I'm a little cautious about throwing out eggs.