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Not sure if this is relevant but reading the "hatching literature" found a few interesting gems:
1. older eggs hatch later, about 1 hour for each day delay in setting after laying
2. older eggs hatch out smaller chicks. Figures if they have been using their yolk resources for longer.
3. Also as we suspect, older eggs have a lower rate of starting to develop and hatching fully formed chicks.
I was able to test this (in a small way) when was sent a couple of dozen eggs that were dated and layed over a 2 week period. It seemed to be accurate.
So when I get a bunch of undated eggs that hatch over a period of 2 days, (and have many that do not hatch) I do wonder how old they are.
That's very cool Phage! So, I have a broody sitting on 1 egg that she laid the day she started sitting, and I gave her one egg that was about 2 weeks old....but had about a 20 hour head start in the incubator... so they should likely hatch about the same time, with the older egg hatching a smaller chick? I'll let you know what becomes of the two chicks. Hatch date this upcoming Sunday is my best guess.