Incubators Anonymous

I have a broody hen, I gave her 5 eggs from a friend's farm then got the bug put 7 in incubator from another farm, then 5 more from yet another farm. 2 were from mine.
 
Got two more eggs in the incubator piping so I should have chicks by morning ..
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ok. I have a friend who has Golden Cuckoo Marans. He has had a hard time hatching their eggs because the shells are really thick. (The color coating on them is thick plus they have lots of calcium) So, my thought is they need to be hatched with really low humidity for the first 15 days. That will enable the humidity to escape the egg and make the air sack bigger, right? (I tried to hatch some of his eggs and noticed that the air sacs were really small at hatch time. Only hatched 50% and two died soon after hatching.) Then increase the humidity to around 60-65% so that the shell can be less hard. My friend says he thinks just the opposite. He wants to have the humidity at 55% until lockdown and then increase it to 65%. I am thinking that the shell is too thick and the air sac will be too small. What do you guys think>? For those of you who hatch Marans eggs, what is the secret? Do we need to sand the shell as some books suggest? Any advise is appreciated.
 
ok. I have a friend who has Golden Cuckoo Marans. He has had a hard time hatching their eggs because the shells are really thick. (The color coating on them is thick plus they have lots of calcium) So, my thought is they need to be hatched with really low humidity for the first 15 days. That will enable the humidity to escape the egg and make the air sack bigger, right? (I tried to hatch some of his eggs and noticed that the air sacs were really small at hatch time. Only hatched 50% and two died soon after hatching.) Then increase the humidity to around 60-65% so that the shell can be less hard. My friend says he thinks just the opposite. He wants to have the humidity at 55% until lockdown and then increase it to 65%. I am thinking that the shell is too thick and the air sac will be too small. What do you guys think>? For those of you who hatch Marans eggs, what is the secret? Do we need to sand the shell as some books suggest? Any advise is appreciated.
All I can say is what works for me. I have hatched alot of cuckoo's and Black Copper, with a 95 to 100% hatch rate (fertile eggs)in my homemade cabinet. I shoot for 35% the first 18 days and 75% for the last 3----real good results. Good Luck!
 
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Just put in these 9.I will find out if they are fertile in a few days here. My last hatch was 16/17, 17 eggs buy day 3-4, 2 infertiles removed day 4. Homemade incubator.
 
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