Thank you for sharing with me. Sorry to hear you went through that! So it sounds like it would be better to have the air cell a little too big than too small. I have my humidity down to 25 or so now. I don’t want my Ameraucanas and OEs to loose too much but I guess that’s better than the Marans loosing too little.Yeah... the Marans are tough. I don’t even check them until day 14 or so. I have 4 with ?s next to them on my sheet. I think we’re on day 9... not a Maran egg, but a Barbezieux which is darker than some, is attached.
I would try lowering the humidity a bit and check/weigh them in a couple days. And hopefully someone will chime in that does the weighing on chicken eggs.
When I ran the humidity too high in my last batch, at day 18 the air cells looked like day 1. Maybe a tiny bit bigger. Now that we’re averaging 25% humidity, they’re on track. I’m just sharing this information with you because I lost 50% of the chicks and they were fully developed. Most likely due to too much humidity during incubation.
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