Help Me with Some Hatching Math, Please!

Anon112

Songster
7 Years
Apr 15, 2018
136
190
178
Mid-Atlantic/East Coast
I have a hen who has been brooding since March 26th (as per a note in my diary). She started with only 3 eggs, and two either fell out of the nest or she destroyed them, so she's down to one egg.

I believe today (April 19th) would be day 24.

We had an unexpected temperature drop from temps in the upper 30s-lower 70s down to 23 degrees one night about a week ago. I don't know, I just have a bad feeling. I candled the egg today and it looks full. (I had a terrible experience accidentally breaking an egg last year candling, so after a quick look today I put it back under her), but I didn't see any movement.

What would be your advice on when to remove the egg if it doesn't hatch and/or she doesn't leave the nest on her own? My fear is that I don't want to take the egg away too soon. Do I just wait a few extra days (like into day 27/28) so that I'm sure it won't hatch?

I know that March 26th was the first day I noticed her sitting in the nest. Am I correct in calling this Day 1?

Many thanks in advance!
 
I'd probably candle tomorrow, and if no movement get rid of it. Generally if they don't hatch by day 22 they aren't going to.
 

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