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I have giant dewlap African geese (both buff and brown) and also South American composite chickens (composite these rare breeds: Huastec, Colloncas, Black Quechua Olmec, and Sweet Potato Quechua). I have some extras, but rather than sell to anyone, I would like find others in Maryland that may...

Yep, anectdotal. No proper studies to prove or exaustively disprove it that I could find. Has anyone scientifically described the very most extreme examples of fibromelanosis? If it does exist and is so rare, I would imagine someone would have to bring it to the attention of researchers to describe.

In Brian Reeder's book he mentions personally observing "considerable darkening of the blood" in the most extreme examples of fibromelanosis. He observed near black blood from Silkies as a child when they drew blood for typhoid/pullorum testing. He also stated that such dark silikies don't...

I wouldn't totally discount the possibility of darkened blood. If it does occur it is extremely rare and only found in the most extreme black individuals. However, how many people are comparing blood samples?

Very Nice! What are they?

Our BQO roo was held for extended periods as a chick since it was a favorite, but it didn't amount to that much total time. We called him to come for treats (crickets and bugs) as he grew up. Now he races toward me every morning to be picked up. If I am sitting somewhere for a while, he will...

Yes, I have seen the same thing. There is definitely a pink color that goes through the shell. I just did some looking into this. Other people have observed this in some South American derived breeds and the Croad Langshan lays a plum egg where the color goes through. It seems to me that the...

Unfortunately I only have a BQO roo who happened not to be black! Not the best picture, since I holding him to get a close up: The BQO do seem to have the most reduced combs. Interestingly my F2 (Huastec x Colloncas) are looking to rival them. The following are the smallest combed of the lot...

I agree!

This is an excellent review of the current state of knowledge (as of 2013) and is put in terms that are easy to understand: http://tru.uni-sz.bg/ascitech/3_2013/001-Fibromelanosis%20in%20domestic%20chickens.pdf It also discusses the effects of interacting genes as well such as extended black...

So even in research circles, there is disagreement on nomenclature. Thanks for your explanation. I would think since it is the convention on this forum, and to cause the least confusion, it would be best to stick with Fm and fm+. Unless I am missing something.

Thank you for your input! Would Fm, *FM, and your EDN3Fm be synonymous, or does EDN3Fm provide additional meaning? What notation would be best to use and in what situations?

If this is how you approached your 5 years of helping, then maybe they are better off without you. I encouraged your efforts here, and was trying to help you make your guide more clear and accurate. I guess it easier to run away, than to admit that you may have been wrong in one aspect of...

That is their best guess at what the duplication event looks like. They did not say for certain that is what it looks like. Whatever is inherited as a unit that results in fibromelanosis IS the Fm allele, no matter what it looks like. What other explanation is needed?

I am breeding for smallest combs and wattles and FM in my South American composites. Some females are showing complete absence of both and some of my cockerels (fall hatched) have very small combs and no wattle growth yet. This is even in ones without beards or crests. My Black Quechua Olmec...

That is not how I understand it. They are calling the whole duplication event the FM locus. It is in their abstract: Explanation done.

I'll open another can of worms here. We should also consider other mechanisms such as epigenetics (heritable changes in gene activity that are not caused by changes in the DNA sequence. Some light reading: http://www.sciencedaily.com/releases/2012/02/120229091844.htm...

The problem that I have with "Fm/Fm/Fm/Fm" is that it essentially means there is a homologous quadruplet and therefore 4 homologous chromosomes. A condition like this would only persist in hypothetical cells that divide into 4 instead of 2. This is clearly not the case here. Genes form...

There are probably multiple unknown genetic factors that affect the level of expression of fibromelanosis. They appear to be recessive and hard to recover when outcrossed. That is why most silkies in the U.S. are not as dark as they once were. Even if silkies were not bred with other breeds...

Yes, I think we are getting somewhere. I agree with everything that you said except for exchanging fm+ with Fm. I should have said that fm+ is the absence of the extra EDN3 CNV. I had said fm+ was having only the original 2 EDN3 genes, which is saying the same thing, but emphasizing the wrong...