felina, Russian Blue Farbratte

Russian Blue / Russian Blue - the colors of the Rat

Kathrin Guttmann Colors, Knowledge, Breeding & Genetic

Already 1929 describes Roberts 1)Roberts, E. (1929), A BLUE MUTATION IN THE RAT (MUS NORVEGICUS), Science 04 Oct 1929: Vol. 70, Issue 1814, pp. 334 blue rats in a laboratory stock. He described the color as similar to the color blue mice, rabbit, cats and dogs, suggesting, that it has already acted to this russian blue animals. 1934 to find and Curtis Dunning 2)AN INDEPENDENT RECURRENCE OF THE BLUE MUTATION IN THE NORWAY RAT: And a Blue-Black Mosaic, Journal of Heredity, Volume 31, Issue 5, 1 May 1940, Pages 219–222 to result again blue rats, genetically with the 1929 discovered animals are identical.

In the Liebhaberzüchterei Blue Rats are Russian still relatively new. The first russchisch blue rats 1993 discovered by Gari Hauser and go back to the rat population by Karla Barber. Geri bought a trio of Karla and when he bred rats, fell in the pitch dark gray Babies, that looked different from the blue rats, you knew so far. The color matched that of blue mice, Cats or dogs, so that one could accept, that they were the same mutation, already Roberts and Curtis & have described Dunning. The color of significantly different from the previously known British or. American Blue Tieren. The first Russian Blue rat was on 25.09.1994 issued in the non-standardized class of AFRMA and on 27.01.1996 Finally, if the standardization.

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The standard for Russian Blue / Russian Blue in pet rats

The Russian AFRMA describes Blue / Russian Blue as "similar to blue mice or cats, a very dark gray with a dark shale ticking. The eyes are black ". The NFRS describes the color as "soft medium-gray-blue with a metallic sheen. Paleness, light speckles or a light ticking (Heathering) is used and no error. The color should be uniform, match the color of the abdomen to the top. The undercoat should be through dark blue to the skin […] The eyes are black. "Following the German standard of color rat should be the color" a medium to be dark gray, which shines metallic […] The coloration on the back and belly is uniform, the color being slightly brownish towards the belly. The undercoat is also gray blue ". A clear Silvering is regarded as an error.

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The genetics of Russian Blue / Russian Blue Rat

Russian Blue is a recessive allele, this means, a Russian blue rat must homozygous (reinerbig) be for the Russian Blue Allel. The locus is in German with rb (for Russian Blue) or. Rb (for non-Russian-Blue / Wild form) abbreviated. Confusing manner, or the same locus in the English-speaking world with d. D abbreviated, which in turn in Germany for English Blue / English blue is used. It is therefore advisable, asking exactly in doubt again, what kind is meant by Blue. Also needs a Russian Blue Rat be homozygous for the non-Agouti-(„Black“)-Allele at the locus and, d.h. it must be genetically aa rbrb. In addition to all the other dilution effect, of course, the color Russian Blue out, so that Russian Blue den Gencode aa B- M- D- rbrb M- C- P- R- etc. must have, So there must be the dominant allele of the wild type for all other dilutions.

Kuramoto et al. examined in a comprehensive study different color mutation of pet rats in hobby breeder holdings in 20103)Kuramoto T1, Yokoe M, Yagasaki K, Kawaguchi T, The mafuji K, Serikawa T. (2010), Genetic analyses of fancy rat-derived mutations, Exp Anim. 2010;59(2):147-55. Under these mutation was also represented, which they called Gray (Degree) and designated by the assumptions they, that it could be either Russian Blues of the East Coast. The corresponding locus of simply inheriting recessive Gray allele on chromosome 8 section 57.3-95.2 Mb. The candidate gene is RB27AB, a member of the RAS oncogene family (Rab27a) und Myosin VA (Myo5a)4)Kuramoto T1, Yokoe M, Yagasaki K, Kawaguchi T, The mafuji K, Serikawa T. (2010), Genetic analyses of fancy rat-derived mutations, Exp Anim. 2010;59(2):147-55.

In the German standard of color rat is reported next to the locus for Russian blue nor a locus graphite. phenotypically Blue by Russian rats should be distinguishable for the recessive allele gr homozygous animals. you Verpaar however, a Russian Blue Rat, which no graphite wears, with a graphite rat, which carries no Russian blue, the result is black babies (as long look no further dilutions or agouti). An international source, which would confirm the presence of a graphite locus, I could not find but so far.

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References   [ + ]

1. Roberts, E. (1929), A BLUE MUTATION IN THE RAT (MUS NORVEGICUS), Science 04 Oct 1929: Vol. 70, Issue 1814, pp. 334
2. AN INDEPENDENT RECURRENCE OF THE BLUE MUTATION IN THE NORWAY RAT: And a Blue-Black Mosaic, Journal of Heredity, Volume 31, Issue 5, 1 May 1940, Pages 219–222
3, 4. Kuramoto T1, Yokoe M, Yagasaki K, Kawaguchi T, The mafuji K, Serikawa T. (2010), Genetic analyses of fancy rat-derived mutations, Exp Anim. 2010;59(2):147-55