Ermine Trace Olwen

prefix Ermine Trace · British Shorthair · DBE-NAD · no blue eye. Carrier status not known · Variant known, this cat untested

Genealogy trace, one printable page carrying the proposed code

Under the variant field this directory proposes, this cat would read DBE 161p. A carrier of a variant with no published allele, on no named line. This is the group bare 161 exists for. The proposal is set out in full here, and no registry issues this field today: it is computed from the record at each build and is not part of any registration.

How this cat is connected to the trait

No recorded parent link joins this cat to a founder or to a tested animal. What the record rests on instead is a variant recorded on the animal itself, DBE-NAD.

Save this cat as a PDF the connection, the genealogy and the source on one A4 landscape sheet, carrying this directory's name and address

How the variant was established

Lineage genotyped, DBE-nad. Not tested. DBE-nad is fixed by a DNA genotype in this cat's offspring. Ermine Trace Nadeya carries DBE-NAD and a dominant allele must come from a parent. No other recorded parent of that cat shows a blue or odd eye, so this cat transmitted it. The deduction is certain and no sample of this animal exists.

Computed from the recorded parentage at every build. It sits above a traced descent and below a laboratory result, and it is withheld wherever a second variant sits in the ancestry.

What it would be carrying

DBE-NAD. Exactly one variant below this cat is fixed by a DNA genotype or by a first-degree lineage genotype, through Dream Ermine Trace, Ermine Trace Nadeya, Metelitsa Ermine Trace, and the name travels back up the path the deduction came down. This names the variant and does not upgrade the carriage: what changed is which test to order.

What the pedigree implies

One of an obligate pair. Paired with Schoenweg Teodoro, for Ermine Trace Nadeya

This is computed from the recorded parentage each time this site is built and is not typed into the register. It is a deduction from the trait being dominant, not a statement by any source, and it is not the same thing as the record's own status field. Only a laboratory settles it for an individual. The full list is on latent lines.

What is flagged on this tree

1. Gic Andy vom Wahrberg. Not the point of entry. Eliminated on the compiler's own breeding experience of this line, not on a laboratory result
2. Esmeralda Ermine trace. The prefix entire, and it spans three breeds. Seventy-one animals: British shorthair, British longhair and scottish fold, one cattery. The scottish fold cats are the point: Ermine Trace Felicita Fantina, Henrietta, Jonathan, Osborn, Queen Qona, Quesadilla, Yashma, Zima and Zarya carry SFS or SFL codes, and Azia Ermine trace, BLH ns 12 33 68, and Unreal Zouwu Ermine trace, BLH ny 11 68, carry the dominant eye code into the British longhair. A dominant blue eye variant established in one breed reaches another by exactly this route, inside one cattery and without any outcross being recorded as such. The whole prefix is entered, not only the coded cats, so that the coded animals have a denominator
3. Ermine trace Olwen. Her ancestry is British chinchilla throughout and the cattery bred her itself. It names the Burgersruh, Goldenen Winkel, Wahrberg and Schoenweg catteries above her and records repeated inbreeding at generations ii-Iii, Iii-iv and IV-IV. Her own dam produced five kittens in three litters and Nadeya is the only one of them with anything unusual: no white and no wrong-coloured eye in any of the others. Source: the Ermine Trace cattery's own published account of the line, 'Reviewing the dominant blue (DBE) gene in the Ermine Trace cattery', 2021, in English translation. A breeder statement and not a peer-reviewed source, and the counts in it are the cattery's own. S_ERMINE_238 | the dam side is closely bred and the sire broke it. Her own coefficient of inbreeding is 9.38 PER cent over four complete generations, with Eric von Buergersruh standing three times above her and Nanook's Silver Ascot four times. Her daughter nadeya's is 1.56 PER cent, six times lower, because Schoenweg Teodoro was imported from Austria and shares almost nothing with this side. Why it matters to the origin question: a dam line bred that closely is exactly where a recessive surfaces, and the cattery's first reading of Nadeya was that she carried a recessive from both sides. The breeding data killed that reading, not the pedigree: Nadeya and her descendants were mated to unrelated cats and the trait came through at about half, which is dominance. The inbreeding on this side explains why the recessive hypothesis was reasonable and does not support it. S_ERMINE_238 | her state is readable and she shows nothing. BSH ns 11: no eye code and no 33 to hide one. She holds no recorded offspring in this register other than the founder, so she cannot be tested by descent here, but the cattery records that her own dam produced five kittens in three litters and that Nadeya is the only one of them with anything unusual. S_ABOVE_247 | the determinant does not have to have come from a parent, and this is why. A founder is the animal in which a variant first appears. A dominant determinant that arises as a new mutation, in the germ line of one parent or in the fertilised egg, is carried by neither parent, appears in no ancestor's pedigree, and shows in the founder and in roughly half of everything she produces thereafter. That is exactly the picture this register holds. The published genotyping finds DBE-NAD in no other line tested. Every record here carrying it descends from Ermine Trace Nadeya. Her sire gave thirteen litters and she is the only dominant blue eye kitten in any of them. Her dam is readable and shows nothing, and her dam's own four complete generations carry no eye code at all. Nothing needs to have come from a parent and nothing did. S_OLWEN_249 | on the suggestion that she may not be the dam. Her pedigree carries no sign of the trait and she had no other recorded litter, so the record cannot be tested against another of her offspring. The register records the question and does not adopt it, for a reason that is arithmetic and not loyalty to the cattery: changing the dam does not solve the problem, it moves it. If Olwen is not the dam, whoever was must have carried the determinant, and no cat in this register outside nadeya's own descent carries DBE-nad. A substituted dam would have to be an animal that carries the variant, left no other trace of it in any line, and is recorded nowhere. A new mutation in Nadeya requires no such animal. S_OLWEN_249

A flag is not an error. It marks a place where two sources say different things, or where an attribution cannot be made on the evidence held.

The record

Register id

erm-03

Sex

female

Cattery prefix

Ermine Trace

Breed, as stated

British Shorthair

Variant

DBE-NAD

Eye status

not-blue: no blue eye. Carrier status not known

Eyes, in the source's words

green

Role

mate

Relations named by the source

dam of Ermine Trace Nadeya

Country

RU

Year

2014-01-27

Photograph credit

Photograph: Lipovenko, Ermine Trace cattery, the cat named in the caption

EMS code

BSH ns 11

The code read out

British Shorthair; black silver; shaded

The description held

black-silver chinchilla; her other four kittens across three litters were all normal; all her ancestors purebred British chinchillas | black silver shaded, no white, green eyed. Abitbol M, Eisele T and Lipovenko E, 'Additional PAX3 Variants for Dominant Blue Eyes in Cats', Animal Genetics 2026;57:e70199 describes her in those terms as the dam of the line's founder. She is not a dominant blue eye cat. S_PAX3_2026_237 | her own pedigree is now held and it is empty of the trait. Thirty ancestors of thirty possible, four complete generations, coefficient of inbreeding 9.38 per cent on twenty-three unique ancestors, and not one animal on it carries an eye code: no 61, no 63, no 68, no 69, and no 33 to hide one on her or on her sire or dam. She is out of Ermine Trace Winnie-the-Pooh by Ermine Trace Daura, both BSH ns 11 and both readable. S_OLWEN_249

Evidence grade

Lineage genotyped not tested. The variant is fixed by a DNA genotype in a parent or an offspring, and only one variant sits in the ancestry, so which variant this animal carries is settled without a sample of its own

In the register

• Parents: Ermine Trace Winnie-the-Pooh, Ermine Trace Daura
• Offspring recorded in this register; a cat may have others: Ermine Trace Nadeya

This directory is a working aid compiled from published charts, registry documents and breeder statements. It is not a register and it has no standing of any kind. The grade attaches to the animal, not to the line: a cat whose ancestor was genotyped is line-traced, not genotyped.