Day 18 of incubation, how low can I lower humidity?

Alaskaduck

Chirping
May 1, 2017
62
14
71
Of the 11 eggs I received from Metzer Farms (they shipped to Alaska) 1 was infertile and 2 showed signs of a blood ring early on. I'm on day 18 with the remaining 8. I kept RH at 45% for the first 13 days. Weight loss wasn't within the 13-15% for ducks so I decreased humidity to 35% for the last 6 days.

Today, at day 18, weight loss is still under ideal. Eggs have been losing an average of 2.7g/day when to be at 13-15% loss, they should be losing closer to 3.4g/day. These numbers are based on a start weight (for 8 eggs) of 600g.

To catch up the loss over the remaining 7-10 days, I need to lower humidity to 20-25% (I think).

My question is, is this low level too low for the last week? Will they lose weight in a harmful or undesirable way?
 

Alaskaduck

Chirping
May 1, 2017
62
14
71
I've been feeling like I'm playing catch up at day 18. Seems the only way to tell if settings have been good enough is weight loss and candling. It's very humid here, been raining since I set them. If they haven't lost enough weight, their air cells could be too small.
 

Alaskaduck

Chirping
May 1, 2017
62
14
71
thank you, it's nice to have others to bounce ideas off of. I've been worried because the drop I did from 45% to 35% raised the weight loss only about 1%. Which I did read a ballpark calculation that said for every 5% drop in humidity, you can expect about 1% in weight loss. We've done so well so far with all the variables of shipped eggs and like anyone, I really don't want to get to the end and have hatch problems be because of poor incubation practices. I feel pretty excited that 8 out of 11 seem viable so far.
 

chickens really

Crazy Mother of Goats
Premium Feather Member
5 Years
Sep 8, 2015
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The Funny Farm....Alberta, Canada
I am actually running my one incubator with no water and the humidity is at 48%.....Its harder to get things correct but is do able...Try lifting the top off to the side even for 15 minutes at a time ?..Remove some water?
 

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