Oldest egg you've ever hatched?

[Apocalypse]

Just wondering how far back people are successfully going. My record so far is 2 weeks. Trying for 3 weeks now... Extra room so why not right?
I am finding a direct correlation between egg age and birth weight. Interested to see if they catch up when reaching adulthood.

 

[sourland]

As a kid, , I had a round metal Sears incubator. I would fill it, hatch a batch, disinfect and refill. I routinely held some eggs as long as 21 days and generally had acceptable hatch %. Eggs were stored in a clean medium, in a cellar that was at 50 to 75 % humidity and around 65 F, eggs were turned daily. It will be interesting to see how your older eggs do. 10 days is the recommended holding period by many, but in nature it frequently takes a hen longer than 10 days to complete a clutch.

 

[julskinka]

I have a 3 w.o. baby who was set and hatched on a 2 week lag after its 5 w.o. brethren that came from the same egg shipment (and they all hang out now and it's adorable and hilarious). That would have made the egg around 3 weeks old at set, accounting for collection and shipping.

There are two others that I set in the week in between, so the eggs would have been around two weeks old. Have had success doing staggered hatches like this in the past, swapping out extra eggs for any duds by D14.

Stored in my basement around 55-60 F, tilted a few times a day.

 

[Apocalypse]

Yeah, I do the same thing. Pack incubator with old eggs and toss any duds 10 days in or so... Fill up the spots with fresh eggs and do a staggered hatch. Well I've done it the most recent time out of three... It worked well and I'm planning the same thing this round.

 

[BlueBaby]

That's interesting that you can wait that long and still have them hatch.