Seal Point Siamese
Stuart Smith's BIS Seal Point Siamese, 2004
A siamese mouse is created by inheriting two copies of the gene known as Himalayan. This may confuse some people, as there is also a variety called Himalayan - this mouse, however, inherits one copy of the Himalayan gene and one copy of the albino (true PEW) gene. The Himalayan gene is essentially a dilution gene, acting first on the main body of the animal and lastly on the 'points'.
Some breeders advise not to breed himalayans and siamese together as the standard specifies conflicting goals: the himalayan must be as white as possible whilst the siamese must possess enough pigment on its body to achieve the correct shading.
What to Look For in the Nest
The darker points of the siamese do not develop until the mouse is older, usually after at least 6 weeks of age. For this reason mice cannot be selected based on their points when they are young and the breeder will have to wait for these to appear. One piece of advice for siamese breeders is to choose the darkest babies that are produced.
Stuart Smith's BIS siamese, October 2005
Outcrosses to be Avoided
Although siamese resembles chocolate, this is a distasterous ingredient and must be avoided. Although in the past it has been reasonably assumed that crossing to a dark chocolate might be beneficial, this is not the case. As the gene that produces siamese is a dilution gene, it has already diluted the colour of the shading and points from black to chocolate. Using a chocolate would therefore only serve to produce lighter points in the offspring.
Seal Point and Blue Point
The only difference between seal point and blue point siamese is whether they are black based or blue based. There is not a disadvantage in breeding the two together, although care should be taken not to lose the seal points to the recessive 'blue'. Black mice can carry blue, but blue mice cannot carry black, so the breeder must always be aware of this and retain enough seal points to continue.
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