What causes porous eggs?

[needtohatch]

I have been saving some eggs to set for about 4 days. When I put them in cartons I checked for air cell placement and only remember having a few that were porous. Today I rechecked them as getting ready to put in bator tomarow and almost all look porous. Did I miss it or can something cause them to become porous?

 

[tazcat70]

From what I understand it is calcium. How much they are getting etc.

I also read somewhere that I hen can regulate how porous they are due to the climate.

Hopefully someone else will see this and let us know for sure.

Good Luck!!!

 

[needtohatch]

We give them layer and free choice oyster shells. They do free range all day and get table scraps (they have to fight the dog for them

). I checked the eggs I got today and only a few are porous, so I just don't know if I missed noticing that many the last four days or if something happened to them after I put them in the cellar.

 

[jnjross]

it's the hen, she may change the older she gets and become more normal