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Originally Posted by pstinard  Hi Diana, I appreciate the controversies surrounding this issue--they are very complex indeed. I answered the Parti question in another post. But if Partis are testing as purebred Yorkshire Terriers, one explanation could be that they have been crossed for so many generations back to Yorkshire Terriers that traces of other breeds are being diluted out by Yorkie DNA. That's one possibility. Since I haven't seen any Parti test results with my own eyes, and since Partis have not been subjected to as much analysis by MARS as Biewers, I don't have enough information to draw any firm conclusions. Sequencing the MITF gene in Partis would help a lot in answering this question. With respect to AKC DNA testing, they only do parentage testing, not breed purity testing, and I'm certain that their parentage testing does not predate the appearance of the first Parti Yorkies. If you have any information to the contrary, let me know!
You have a good point about German Yorkies, but my understanding is that pedigree records for them is not as good as in the United States. And again, there was no DNA testing back in the days of Mr. Biewer.
About Biewer to Yorkie breeding, once that is stopped, and you start breeding Biewer to Biewer, the gene pool becomes fixed and the breed stops becoming more and more Yorkie-like. That would explain the MARS results showing that the Biewers they tested were in a unique and uniform group.
About the Biewers that were tested by MARS, yes those mostly came from one club. I don't know whether the person who submitted the DNA samples claimed to be a vet or not, but it doesn't matter, because DNA doesn't lie. If someone has serious issues about the validity of the samples, they should ask for them to be retaken and retested, but I'm sure the results would be the same. I agree that it would be great to test all Biewers from all clubs, but since that might include Biewers coming from Biewer by Yorkie crosses, that would basically be like throwing mixed breed dogs into a purebred test--the results would be interesting, but they wouldn't be informative or normative. I understand that there is some kind of turf war going on with respect to which clubs have the "true and authentic Biewers." I would recommend that all of the clubs doing Biewer by Biewer matings get together, submit their dogs' DNA for analysis, go over the results together, and try to reach some kind of consensus. |
There is no turf war.. all of the Biewers came from the place.. they are all the same dogs.
Here is the history of the Parti DNA testing as taken from Deb Mullins site:
snowblueyorkies.com
The Tri- color had been showing up in litters from Ashley since 1984 and Nikkos Kennel had been quietly placing them in pet homes and asking people not to say where they got them.
Crownridge and Summit had obtained Parti colored puppies from Nikkos kennels and wanted them AKC registered with their true parti-colors . So in 1999 they convinced Nikkos Kennel to go to AKC and get them registered as yorkshire terriers parti color.
This turned out to be a very lengthy and costly process to Mrs. Lipman,(Nikko's Kennels) as AKC shut down her kennel in 1999 for 18 months to conduct DNA studies of 42 litters sires and dams. She was not allowed to breed or sell or conduct any business during this time.
3 of the dogs tested were owned by Mrs Bogren(Crownridge) and 1 owned by Mrs Gesmundo(Summit Yorkies)
During this study AKC also spoke to several other breeders about tri colored pups born in other bloodlines.
Many highly respected breeders admitted they occasionally had these tri colored pups born.
AKC went back as far as they could with the living dogs. They DNA'd about 42 litters. They also talked to a lot of the "old" breeders and they told them they had always been in the lines but were disposed of.
In June of 2000. The DNA studies of Nikko’s Kennel was completed to the satisfaction of AKC.
AKC deciding that after a study of the Yorkshire History and the DNA of the dogs involved in the study they were satisfied that the color can be produced in otherwise normal litters of Yorkshire Terriers.
Hope that helps you..
Diana
