~ We are currently taking a haitus from breeding ~
~ This means that we have no
Available Peterbald Kittens ~
I am not sure when, or if, this will change
However, if you need leather work,
if you live in NW Oregon or SW Washington, and need Western Horse Riding Lessons or would like to have your horse trained - look me up at www.weRideHorses.com !
Shamira Cattery -
Theory on Genetics of Peterbald Coat
Explainiation and comparison to tabby pattern genetics - Kate Mabry
You are welcome to reference this theory, but, please let me know, and please give me credit ~
Through the years, many breeders have written to ask about the Peterbald.
Most often, "If I breed "x" to "y", can I produce hairless cats?
In this explaination, I have tried to keep the comparison as simple as possible.
If you genuinely do not understand genes, dominant genes, and modifiers, ...you may well be lost. However, if you would like to be able to make predictions of color, coat type, etc,
well....you probably ought to decide to learn the basics.
The genetics behind the coats is still not fully understood. There is a University in the US, UC Davis, that is trying to collect cheek swabs from Peterbald cats so they might do a study on the genetics behind the coats, but they need many more swabs and are trying to collect from several generations (adults and their offspring, three generations is their request, and they hope to have 150 samples to do the study when i last spoke to them) and it has been difficult to get this amount of material for them.
After much consideration, I find I cannot draw a simple comparison to basic color genetics, though I have explained it to be more like tabby markings in other breeds (again, in my opinion & understanding based on my own program & research) .
When breeding 2 cats considering tabby pattern, we understand that classic tabby is the most recessive tabby pattern (gene). Which is to say, to have a classic tabby, a kitten must get this gene from both mother & father. With 2 copies of the classic tabby gene (one "copy" from each parent), the kitten is born with a classic tabby pattern. Likewise, any future kitten born of this classic tabby cat will carry the classic tabby pattern, and the offspring (the "grandbabies" of the original two cats) - even if they do not carry the pattern themselves - may produce a classic tabby kitten if bred to another classic carrier. The means by which a breeder can attain this pattern in their program is very similar to the means by which a Peterbald breeder can produce an Ultra Hairless Peterbald kitten. The Ultra Hairless kitten must get two genes for the lack of coat, one from each parent. Just like you cannot produce a classic tabby from one classic tabby cat and one solid cat with no tabby behind it, you cannot produce an Ultra Hairless PD from a PD and an Outcross (oriental or Siamese).
Next we come to the mackerel tabby pattern, which is dominant to Classic. So, if a kitten has one copy of the classic modifier along with one copy of the mackerel modifier, the mackerel will show. This seems most similar to the Peterbald Chamois coat. Two chamois PDs may produce an ultra bald, just as two mackerel tabbies may produce a classic tabby - but your odds, statistically, will be skewed due to the use of outcrossings. To try to avoid confusion, the straight statistics on this would be approx 25% of the kittens produced from two chamois coated PD cats should be ultra hairless. (If you REALLY grasp this, and want to discuss why your results are different, send me a note.)
Then, third, I consider the spotted tabby to be similar to the Brush coat. Just as the spotting is only a modifier of the other tabby patterns, it seems logical to me that the Brush is a modification of the PDs hairlessness. As it is possible to bring a classic tabby from two spotted tabbies, it is also possible to bring an ultra hairless from two brush coats. The odds of seeing an ultra hairless from two brush coats that are both out of PD parents seems higher than the odds of seeing an ultra hairless kitten when one or both parents has a siamese or oriental parent, which also makes sense if you follow my theory...
The straight coat, then, would be most like the solid colored cat in the tabby breeding program. While you may disagree if you truly understand tabby pattern genetics, you must consider that we are trying to introduce the PD gene into a gene pool that has not previously had the gene. So, it would be like trying to have a goal of creating all mackerel tabby cats from a gene pool that has never, ever had any tabby behind the solid colored cats.
Just as breeding two solid colored cats (again, if there was NO tabby behind) would never bring a tabby- breeding 2 straight coated PDs will never bring a brush, chamois, or ultra hairless... This is because there is no Peterbalds behind the Siamese & Oriental lines that we use. This also makes sense in my experience when I consider that I have seen higher percentages of PD kittens born of a straight coated PD bred to a PD of any non homozygous coat type (ie, a brush or chamois).
I will try to summarize in case I have completely lost you. There are very few guarantees of coat type in this breed. Using an Ultra (or sticky) bald will not bring straight coated kittens, whether bred to a Siamese or oriental, or bred to another PD. It is possible to have brush coats from an ultra bald PD even if bred to a chamois PD. If you are unwilling to "risk" producing straight coated and brush coated kittens, this is not the breed for you.
Breeding 2 ultra bald PDs will bring a litter of unhealthy kittens that will likely not survive and should not be attempted.
We have left our "Past Kittens" page in place for anyone to reference. Here, you will find photos of each kitten produced from various breedings, and can reference weekly photo updates to see how their coat changed over the course of the first 4 months of their life. The theory above was formed not only from my own experiences, but also from the information I've gathered through the years in speaking with countless other breeders. Thanks to all who have shared their experiences & helped me along the way! p