Hatch-ability by day

[CGilbert]

So I've always read that you should set eggs within the first 10 days and that after that, the hatchability goes down. Does anyone have numbers behind this or is it just hear-say? I'm not doubting that it goes down at 10 days, but what percentage was it at 5 days? 10 days? 15 days? 20?
Anyone know? Or know where to find the information?

Thanks!

 

[Pork Pie]

Honestly not sure, but what i do know is that when i have a no-hatch egg, its always the oldest egg that i set.
CT

 

[CGilbert]

Honestly not sure, but what i do know is that when i have a no-hatch egg, its always the oldest egg that i set.
CT

Do you always check it to make sure it was fertile?

 

[Pork Pie]

I would always check before i collected eggs for setting, but when i was hatching young, i only had 7 hens and one roo, and i only took eggs from one hen. This happened three times in a row, so it was not an off chance event.

CT