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Originally Posted by Raymond's Mom  My source regarding the biewers comes from the biewer breeders. Are you familiar with Leon Whitney's book "How to Breed Dogs"? It's an old book, I'm sure now out of print. But it explains the mode of inheritance of color and pattern for most all breeds. I'm not going to spend my holiday weekend researching but it would be interesting to know if the piebald pattern is a simple recessive gene. |
In 2008 the Biewer Breed Club of America participated in a genetic study of the piebald coat color conducted by University Of Saskatchewan Department Of Animal Science under the direction of Dr. Sheila Schmutz. Dr. Schmutz presented this study at the 4th International Conference on the advances in canine and feline genomics and inherited diseases in France.
The results of which stated all the biewers were homozygous for the SINE mutation in the MITF gene promoter. This is the same genotype (SINE/SINE) that has been found in all the other piebald dogs we have tested.
4th International Conference: Advances in canine and feline genomics and inherited diseases
More from Dr. Schmutz.
Dog Coat Color Genetics
As a member of the BBCA whose members include breeders responsible for importing the first biewers into the US....I have never once been told nor shown any evidence that Mr. Biewer bred anything other than yorkshire terriers. Again if one wants to ascertain where perhaps the piebald gene was introduce into the breed...if one believes that had to happen...doing so is simply conjecture because no one knows. Any conjecture on the german breedings are a moot point regarding the partis that were produced in the US.
The common denominator in both breeds....the line traces back to the same kennel in the United Kingdom and there is evidence to support this.