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First, single comb is a simple recessive gene that is recessive to rose comb. I targeted my single combed breeders several years ago and eliminated them. I haven't had a single comb in several hundred chicks since and if I get one, I know what is going to happen to that bird (unless I can get the SOP to switch to Wyandottes with pea combs
). There is actually a pretty obvious difference between a rose comb that carries single and one that is homozygous for rose. If you look at the pic you posted, you can see rough edges and a fairly flat overall comb. Those are generally the effects of carrying a single gene.
You mention that the varieties are so rare, we must preserve the breed "no matter how it is done." Preserving a breed can never be accomplished by crossbreeding. By crossbreeding we, by definition, take a breed and make half of it another breed. That is not preservation of any one breed by my standards, at least. If we take the time to learn about color genetics, we can make a good cross with the closest color and work our way back without losing the basis of the breed. Just because Brahmas, or Cochins or whatever where part of the original recipe for Wyandottes, in my opinion, that doesn't make it not crossbreeding to use them.
When I say genetic diversity, I don't mean in one breed. A breed isn't supposed to be genetically diverse. That is the definition of a breed. The chicken as a whole needs to be diverse. Each breed should remain a breed to maintain the diversity of the whole. That's why crossbreeding gives us hybrid vigor and other advantages commercially.
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Please expound. I don't bite, at least not hard
The panic caused by the Exotic Newcastle scare a few years back and the Avian Influenza is, admittedly, largely due to the huge amount of $$$$ that stands to be lost. a 0.5% reduction in egg production over 2 million hens is 10,000 eggs/day. Those hens could never be treated on an individual basis and group treatment is sometimes more costly than dealing with the loss in production. In my opinion, that is why commercial poultry is especially susceptible to disease. And, I will still maintain that the right strain of the right disease would hurt commercial poultry much more quickly and in a more devastating manner than it could ever affect the pure-bred hobby for these same reasons. Correct me if I'm wrong, but don't just say it ain't so. My use of the word "any" was exaggerated. Point taken.