This discussion actually brought up something interesting in my recent Silkie hatches - most all of the mortality of my eggs has been occuring just prior to hatch; I've been getting a 75-90% hatch rate on average from my Silkie eggs, but of the ones which did not make it and which I autopsied, all had incredibly large vaulted skulls. Coming up maybe 1/8-1/6 of an inch off the head. I remember noting this originally, I'm not sure why I didn't find it stranger in the first place. Is there a Silkie version of the Cornish deleterious gene? Where they've been so overbred for characteristics like a large crest that the resulting impacts becomes semi-lethal or lethal to embryos? I checked my copy of Genetics of the Fowl to see if there was any info on it, but came up empty - only a small passage regarding the vaulted cranium of crested breeds but with little regards to the genetics of it.
I'm a huge genetics nerd so this is definitely a point of (somewhat morbid) interest for me.
As with humans ,once you get them past the danger period the skull should grow over.
Edited by Fancychooklady - 4/28/16 at 8:56pm