Numbers

I was drawing up the kittens' 4 generation pedigrees last night, a somewhat complicated procedure involving lots of strings of numbers (the cats' registration numbers) and thus checking and rechecking that I have copied the numbers correctly. I'm not finished yet, it's kind of a work in progress lol.

It was really quite interesting though. I haven't looked at Indigo's and Harry's pedigrees for a while. Indigo is a 5th generation Tonkinese, so her pedigree is all Tonk, and all the breed numbers are 74 and variations thereof. Harry though, Harry is a 2nd generation Tonkinese, so his near ancestors contains both Burmese and Siamese influences. So there's a liberal sprinkling of 24s (Siamese), 27s (Burmese) and even a couple of 32s in there as well (Tabby/ Tortie/ Red/ Cream/ Apricot Siamese, as these colours were not originally accepted by Siamese breeders, hence the different number)

As to which generation the kittens are, it's the lower of the parent's generations, plus one. So they are 3rd generation Tonkinese. Their parents and grandparents are all Tonks, their great grandparents and their great great grandparents are Burmese, Siamese and Tonkinese.

All the cats have letters before their number, too. Now Tonkinese are a relatively new breed (although in the 'wild', they are as old as the hills... there are Tonkinese street cats wherever the Burmese and the Siamese are...) so there are different codes, and it all gets quite confusing. There's a brilliant guide at Mymystic Tonkinese but I'll try to summarise on here as well.

If the cat has a CSREF on its registration number, it is e on the reference register. It is either a first generation, second generation, or has a solid or pointed coat pattern- so both Indigo and Wendell have CSREF before their numbers. CSREF cats can be bred from, if also registered as active (Indigo is, Wendell is not) but they cannot be shown in pedigree classes.

If a cat has CSSR before it's numbers, it is on the supplementary register. This means that the cats ancestry for 3 generations consists of mink tonkinese, pointed and solid variant CSREF Tonkinese PLUS at least one ancestor from a back cross mating (Tonkinese with Burmese or Siamese, but only pre 1997, it's not allowed now) or a pre 1999 first cross mating (Burmese x Siamese) All the minks have a CSSR before their number (as does Harry, their father) because they have a Siamese and a Burmese as a great grandparent. CSSR kittens can be shown. They can also be bred from if also registered on the Active Register, which mine are not, of course.

and THEN, we have the registration CS, which is the full register- fourth generation and above mink Tonkinese and onwards. Indigo had a mink brother, who would have been CS. Don't let the name 'full register' fool you though... all the codes are properly GCCF registered pedigree Tonkinese cats.

Tonkinese are such a 'new' breed (see proviso above!) that CS registered cats seem to be the exception rather than the rule- there's only one CS Tonkinese cat on the REM litter's whole pedigree! Once you get further and further up the generational ladder, the gene pool available for mating gets smaller and smaller, so eventually you have to mate with lower generations with new bloodlines in order to keep the gene pool healthy.

Not that this will matter to ANYONE but me of course... I suspect I'm a bit of a nerd *grin*. What can I say, I find it interesting!