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Originally Posted by Pinehaven I'm not trying to be argumentative, I'm just trying to get people to really think about this, so here we go .... .....
The white gene (parti gene in this case) is a recessive gene and will only display itself if bred to another white gene carrier. So even if history shows that the foundation dogs NEVER, EVER, bred to any color but grizzle, black/tan, black/gold, blue/gold, blue/tan, that doesn't mean that none of those "standard" colored dogs, didn't carry the recessive white gene.
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I have given this a great deal of thought. I actually began reading about the other colors when I saw a chocolate that I dearly admired. I decided against that purchase and in the same research developed my opinion on the Parti-Colors as well. I am still open to new information but have not seen anything convincing that the white color was naturally occuring in Yorkshire Terriers.
The main idea of those against breeding the parti-colors is that
there is no Yorkie white gene (recessive or otherwise) that would create a parti -- there is a difference in the genes that make a small white blaze that will go away in infancy and this mostly white color that is being called a parti. There is not just one gene for white hair. Too simplistic.
Here is a site that you might want to read.
http://members.aol.com/CYorkie/BiewerTriColor.html It explains the genetics of the so-called white gene, actually the piebald gene. It is well worth the read. Keep in mind that this is also the opinion of the official Yorkshire Terrier Club of America -- and they are the ones that set the standards listed for AKC. So, there is an official body of expertise that has put quite a lot of time and consideration into their stance.
The point previously made about the parti's not showing up in show lines is what really got my attention. If it really has been there all along, recessive or not, then it would have shown up a lot more often along the way -- not just cropped up in profusion after the Biewer news. The piebald markings would be showing up in professional show breeders pups, and not just the obscure lines that wind up tracing back to someone with multiple breeds. I think there are honest people who think they are breeding pure bred Yorkshire terriers with parti genes. I think they are wrong and someone, somewhere along the line was either deliberately duped or maybe a little careless when breeding multiple breeds. JMO