Purebred Appenzeller Spitzhaubens or mixed?

[CashewVulture]

Big nostrils should mean two V comb genes, which would mean purebred Spitzhauben in this case.

Source:
https://pubmed.ncbi.nlm.nih.gov/2013692/
That has the abstract from a 1991 paper
"Some observations on high cavernous nostrils in the chicken"
by R G Somes Jr



Since the nostril types, the comb shapes, and the crest direction (forward vs back) are all correct for Spitzhaubens in some chicks, and all those points are wrong in some other chicks, I think you probably can identify the pure Spitzhauben chicks by that collection of traits.

I would still keep an eye on them as they grow up, in case something unexpected comes up, but I don't really expect you to find anything.



Spitzhaubens are not supposed to have yellow in their foot color.
But if each Spitzhauben has two copies of the dominant gene for white skin (not yellow), then no chick would have yellow in the feet even if they did have a father of another breed.

So I think the yellow feet show that you have at least one Spitzhauben hen carrying a wrong gene for skin color, plus the Icelandic rooster having that gene as well. If you get any pure Spitzhauben chicks that show yellow in the feet, you will know the Spitzhauben rooster carries that gene as well.

You were a great help, thank you for all the information! I really appreciate it!