Log thanks to you and Miss we can rule out some standing rules!!I love experiments! I did one last year when I had some shipped eggs arrive very dirty. I decided to expiriment and see if washing them had any effect. Some I left plain, and the others were washed in different solutions. Bleach, vinager, soapy water ect. I had a few hatch in every set, so I concluded that it didn't matter much if you choose to wash your eggs or not before hatching, though, I bet it keeps the bacteria out if you just set clean eggs.
I have set some porous eggs from some of my own hens on occasion. I don't think I have ever had more problems with the porous ones, but I do keep my nests pretty clean to begin with and the eggs from my ladies are rarely dirty. I would think that if you eat a clean porous egg it would likely hatch, but maybe not if it were a dirty one. Good luck!
On a side note, I candled the guinea eggs today and pulled out 3 that were very clear. The others I am not positive on, but looked to have some veining happening in them. I didn't bother to check that Marans tonight, and will be heading down to fill the empty incubator spots with my SBELs.
One less thing to worry about.
Miss i would think the porous might be from diet. Maybe they need more protein? or something My eggs though some are smooth as glass others not shiny but chalky porous and the inbwetween regualr eggs...and all of them get the same food. Layer feed scratch and crimped corn free range too and some junk leftovers now and then..usually white or rye bread and strawberry tops..... old pasta. this and that im throwing out if it isnt moldy.