The Alice Kline book names 7 ebony mutations. They are Tasco (dominant), Busse (dominant), French Blue (dominant), Lester black (or Midwest City black, recessive), Sakrison (recessive), Treadwell (recessive), and charcoal (recessive).
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And to think everyone in the US simply refers to them as ebony chins! I knew there were a few different genetics that made up the US "Ebony" but didn't realize there were that many different mutations that had popped up! I have been working with the ebony genes for quite awhile now and I definitely think that there is a lot going on in my chins. I know I have worked with chins that definitely had Charcoal recessive genes in their background. I also have a chin that has thrown kits very much like a simple dominant recessive. He is pure black, mated to all pure standards, and every single litter he throws always has one standard and one pure black ebony chin.
I think mahogany is a different critter all together. Haven't seen one in six years, but the ones I did see would only show up if the chin was pure black. It was almost like it was tied to the chin being one uniform color. Parents would be normal tans or non-pure black ebonies. I would absolutely love to play with that mutation.
I'm pretty sure that I've had a few "Mahogany" chins born here. The first time it happened I was a bit surprised and started asking the older ranchers/breeders if they had ever seen a kit with the unique color that I had. Based off my description and the photos I said I got told by a few individuals that the kit looked like a Mahogany. Since then I've had quite a few kits with similar phenotypes born here. In fact I ended up showing a few and the last one had 2 different judges comment that she seemed to be expressing Mahogany instead of just ebony. I have her younger brother growing out for show now and he looks just like her. It will be interesting to see if he gets the same comments on the show table as she did!
Cheryl