What makes eggs too porous?

chickmanna

Songster
8 Years
Mar 12, 2011
184
3
101
Battle Ground, WA
Here is the picture from another BYC post of an egg that was too porous.

82380_230_a_porous_egg.jpg


I ordered eggs from several breeders this last week and many of them resembled this picture, (spotty, mottled egg). Not quite this bad, but certainly not the solid shell I see from store bought egg and one of my own hen's eggs that I candled for comparison.

So what causes porous eggs? What effect does it have on hatchability? Do these eggs lose moisture more rapidly in the incubator, and is an adjustment to the humidity level necessary?
 

quintinp

Songster
9 Years
Oct 22, 2010
2,067
26
171
Southern Oklahoma
I think it is lack of Calcium in the hens diet. I have recently changed from Country Lane brand chicken feed to Nutrena, and have started getting lots of eggs. They are very nice eggs too. What type of feed to you give your hens?
 

chickmanna

Songster
8 Years
Mar 12, 2011
184
3
101
Battle Ground, WA
I feed Layena with oyster shell always available. My eggs have nice even shells, very glossy and substantial when I break one. The eggs I'm worried about came in eggs I had shipped in last week for hatching. I'm mainly wondering whether this is going to effect hatchability and if there is anything I should do differently when incubating these eggs - change humidity, etc.
 

CapricornFarm

Chicken addict
Premium Feather Member
11 Years
Feb 1, 2010
75,785
270,643
1,807
Southern Virginia
I find porous eggs generally come from older hens. For the most part, I don't think it affects hatchability unless the shell is very thin. I have seen this topics on threads before, so you might want to do a search .;-) Deb
 

billiejo21

Chirping
8 Years
Oct 16, 2011
289
1
89
Iowa
I've hatched shipped porous eggs and didn't see a difference in hatch rate. I've seen lots of threads about this too...not sure if there is any one thing in particular that causes it...
 

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