Breeders Info

Langford Laboratories HCM Statement re Siberians


HCM is the most common form of heart disease in domestic cats and it is likely that it is caused by different mutations in different breeds; many of these mutations are as yet unidentified. Langford College Bristol University are currently carrying out research into HCM in Siberians and other breeds. They don’t have the knowledge of the General Echocardiography Screening Programme through their specialist cardiology service to add to this. As yet they don’t know the basis of HCM in Siberians.


The two HCM causing mutations have been identified and they offer genetic tests for those linked with HCM in Maine Coon and Ragdoll cats respectively. The mutations are specific to these breeds, so testing for either mutation in Siberians is not likely to be informative unless they have Maine Coon or Ragdoll ancestry. There are 837 Siberian Cats on the database and only 3 have tested for Maine Coon HCM (all normal) and none for Ragdoll HCM.


The Main genetic tests that would be relevant to Siberians are the blood group Polycystic Kidney Disease (PKD) at low prevalence. Pyruvate Kinase Disease PKdef and coat colours. Website now updated per their advice to reflect this.

Registration Policy

The below PDF file contains all the details of the Siberian Cat's Registration Policy with the GCCF. If you need any further information about this please contact our Club Secretary and we will do our best to help you.

Breed Numbers

The Siberian is recognised in 124 colours. Within this the Solid White has four different eye colours and each is recognised by a different breed number. Any amount of white is allowed, (i.e. white on paws, chest, belly, blaze, locket etc.) on all patterns and colours including the colour pointed variety. The colour pointed variety is sometimes refered to as Neva Masquerade. Allowance should be made for belly spots and shading on colour points.

The only colours that are excluded under all registering bodies are Chocolate, Cinnamon, Caramel and the corresponding dilute colours (Lilac, Fawn, and Apricot) in any pattern combinations (solid, bi-colour, tri-colour, tabby or colour pointed.). Non-permitted colours also extend to cats that show Burmese or Tonkinese colour restrictions.

The cross over of colour registrations between other registries and GCCF does not include "Golden Tabby" or any of the it's sub colour groups (e.g. Golden Tortie Tabby, Golden Shaded or Golden Tabby & White). These are not recognised under GCCF because the Golden Tabby is not a genetic colour, it is simply a colour expression of Brown Tabby. Golden Tabbies exhibit wide agouti banding on the hair follicles (limited black banding on the hair shaft) therefore allowing more light to penetrate through the coat giving it a warmer tone. All cats that are registered Under FIFE or TICA as a Golden Tabby will be registered as a Brown Tabby if transferred into GCCF.

The PDF file below details all the recognised colours of the Siberian Cat under the GCCF, including Colour Point varieties, and lists their corresponding GCCF Breed Numbers.

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