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PostPosted: Mon Jan 01, 2018 10:00 am 
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Newbie
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Joined: Mon Sep 23, 2013 7:17 am
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Hi people
Have an rcom 50 running with approx 30 fertlie eggs on Day 18/19, just about to go into lockdown. But feeling worried since air sac is not how it should be, still too small for most of the eggs.
Had this happen 2 batches ago with a disastrous result, 1/18 :-(

Ambient humidity down here in Hobart has been high, around 50% often. Rcom 50 panel has showed b/w 45-50 over last week.

Do I lockdown on same humidity setting of 45 and keep my fingers crossed?
Or put up to usual 60 and say a few prayers?

Either way am not getting a good feeling about the outcome........
Any advice from experienced rcom owners would be much appreciated!!
:th


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PostPosted: Mon Jan 01, 2018 9:24 pm 
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Golden Kingfisher
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Joined: Tue Dec 16, 2008 9:54 am
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Location: Canberra
Put it up to 60. Keeping it lower will not help at this stage.

Next time around consider adding no water at all to the incubator if the ambient humidity is high and if you’re incubating eggs from the same birds.

Fingers crossed here.

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Cheerio, Rach
Blue Swedish Ducks


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PostPosted: Mon Jan 01, 2018 11:15 pm 
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Proud Rooster
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It should be kept in mind that relative humidity refers to the amount of water vapour in the air relative to the maximum that could be held at that temperature. Thus, for example, if the ambient RH is 50% at 30 C that will become only about 31% at 37.5 C in the incubator.
If there is very little moisture being lost from the eggs it might be worth checking that the displayed readings on the incubator are accurate. An actual temperature lower than the indicated temperature would result in less moisture loss at the set humidity reading (and late hatches).
My Rcom has always produced OK air cells when set at 45% RH.


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PostPosted: Tue Jan 02, 2018 6:32 am 
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Golden Kingfisher
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Egg shell porosity varies a lot between birds and that’s going to affect moisture loss. Thicker shells, thicker membranes and fewer pores mean a lowered capacity for moisture loss. Eggs like that need lower humidity. So, what works for one lot of eggs won’t work for someone else’s eggs. It’s a matter of trial and error and learning and adjusting as you go.

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Cheerio, Rach
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