Judging Incubation Age Help

JacinLarkwell

Crossing the Road
Mar 19, 2020
17,148
41,153
951
South-Eastern Montana
Anyone here good at judging incubation age? I have some eggs I really don't know how old they are, just that they're not ready to hatch yet.

Also how long after draw down does the internal pip happen? Or another way of asking, what day does draw down happen? Is it safe to stop turning eggs when it's noticed? (Hand turning and again no idea the age on these eggs)

I can provide pics of the ones I'm unsure about if anyone thinks they might be able to guesstimate a close age, I do know they're already got their feet developed.

Do they see the light of a Chandler when it's used? I've noticed one is incredably active when I use it, and the other 4 aren't

Here's the link to my post with them going day by dayish, but not a lot of traffic there and I'd like answers as soon as possible just so I don't keep turning when I'm not supposed to.

https://www.backyardchickens.com/threads/2021-jacin-hatchalong-1.1452821/
 

The Kooky Kiwi

Crowing
Dec 23, 2017
756
2,163
286
New Zealand, Golden Bay
Hey Hey :)

If you have pictures of your candled eggs I'm happy to give you my estimation on their incubation age. In the meantime - here's a chart that I used to find useful when learning to candle.

If your eggs are starting to draw down then I'd say it's safe to stop turning them. In my experience.. hatching normally occurs in the 2-3 days after drawdown.

Candling Progress Pics - Chickens.jpg
 

JacinLarkwell

Crossing the Road
Mar 19, 2020
17,148
41,153
951
South-Eastern Montana
Hey Hey :)

If you have pictures of your candled eggs I'm happy to give you my estimation on their incubation age. In the meantime - here's a chart that I used to find useful when learning to candle.

If your eggs are starting to draw down then I'd say it's safe to stop turning them. In my experience.. hatching normally occurs in the 2-3 days after drawdown.

View attachment 2643653

It's hard to tell, they're between the last half of the 3rd row and first half of the 4th row.

I'll try to get better pics tomorrow, we had lights on that probably made them harder to see

20210430_233735.jpg
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The Kooky Kiwi

Crowing
Dec 23, 2017
756
2,163
286
New Zealand, Golden Bay
It's hard to tell, they're between the last half of the 3rd row and first half of the 4th row.

I'll try to get better pics tomorrow, we had lights on that probably made them harder to see
I can clearly see the embryo so I'd say past day 7, but the embryo is not taking up much of the egg so I'd say, as a rough guess, those eggs are approximately 8-12 days into incubation.

When did you put them into your incubator??
 

The Kooky Kiwi

Crowing
Dec 23, 2017
756
2,163
286
New Zealand, Golden Bay
I can clearly see the embryo so I'd say past day 7, but the embryo is not taking up much of the egg so I'd say, as a rough guess, those eggs are approximately 8-12 days into incubation.

When did you put them into your incubator??
As an additional note - it may be the location of the torch in the pictures, but I cannot easily see the air cell. If you are confident that your humidity levels have been correct then you can also age the stage of incubation by the air cell size.

Candling Progress Pics - Air Cells.jpg
 

JacinLarkwell

Crossing the Road
Mar 19, 2020
17,148
41,153
951
South-Eastern Montana
I can clearly see the embryo so I'd say past day 7, but the embryo is not taking up much of the egg so I'd say, as a rough guess, those eggs are approximately 8-12 days into incubation.

When did you put them into your incubator??
They went in the 18th, but had been sat on before then for a few days.

I'll try to get a better picture tonight, they're taking up at least 1/3 of the eggs
 

The Kooky Kiwi

Crowing
Dec 23, 2017
756
2,163
286
New Zealand, Golden Bay
As an example - I have several sets of eggs in incubation at the moment - I just went now to take pics for you to compare with.

You can see the different in air cells and embryo development.
Your eggs look quite similar to my Day 7 eggs - perhaps a few days further along?

Eggs at Day 7 of Incubation

Day 7 - A.jpg Day 7 - B.jpg

Eggs at Day 14 of Incubation

Day 14 - A.jpg Day 14 - B.jpg
 

The Kooky Kiwi

Crowing
Dec 23, 2017
756
2,163
286
New Zealand, Golden Bay
They went in the 18th, but had been sat on before then for a few days.

I'll try to get a better picture tonight, they're taking up at least 1/3 of the eggs

If you placed them into the incubator on 18th April then they are "at a minimum" - 14 days into incubation (plus any days previously incubated).

Given your pictures I would not consider them much past that 14 day mark - so, if it were me, I'd work on the assumption that the hen hadn't started sitting or incubating in earnest prior to you taking the eggs and therefore your likely hatch date will be about the 9th of May (21 days from when you set them in your incubator).
 

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