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b: Brown - The rabbit is brown based, meaning base colour is chocolate or lilac.
"C" is next "letter". This "letter" tells rabbit whether or not to have red colouring, as well as how deep and dark base colouring is. The genes are as follows:
C: Full Colour - The red colouration of fur is full expressed, and base colouring is also fully expressed.
c(chd): Chinchilla Dark - All red colouration is removed from coat, but base colouring is still fully expressed.
c(chl): Chinchilla Light - All red colouration is removed from coat, and base colouring is lightened, causing darker shading around head, ears, tail, feet, and legs.
c(h): Californian - All red colouration is removed, and base colouration is restricted to nose, ears, feet, legs, and tail. The eyes are red.
c: Albino - All colour is restricted, leaving a pure white rabbit with red eyes.
Next in genetics alphabet is "D". This "letter" determines how much pigment is in each hair shaft. The less pigment there is, lighter colour is. The genes are as follows:
D: Dense - Full amount of pigment
d: Dilute - The pigment is less, causing colour to look diluted.
The "letter" "E" controls banding, or colour rings (remember in agoutis where you can see rings when you blow into coat?) of a rabbit. The genes are as follows:
E(s): Steel - The undercolour is extended and "takes over" colour, leaving a mostly solid coloured rabbit with some gold or silver tipped hairs.
E: Full-Extension - The rabbit has normal colour, and bands are not disturbed.
e(j): Japanese - This takes bands and actually seperates band colour into different hair shafts. This is how Tricolourr and Harlequin are produced.
e: Non-Extension - There is no colour extension, leaving only what would be intermediate band in a normal coloured rabbit. This is how Oranges, Frosed Pearls, and Tortoises are produced.
The "En" "letter" controls a different type of pattern. The genes are as follows:
En English Spotting - The rabbit is white with coloured spots.
en: Solid - The rabbit has no spots.
"V" is next "letter" in genetic alphabet, and for most breeds, no more of alphabet is needed to know variety. This tells whether or not rabbit is a Blue Eyed White.
V: Non-Vienna - Normal coloured rabbit.
v: Vienna - Blue Eyed White.
This "letter" is rarely included in genotype because it is not very important in most varieties, though all varieties DO use it.
W: Non-Wideband - Normal colouring.
w: Wideband - The red colour becomes very intense, intermediate band widens, and red colour "takes over" all tan pattern and agouti markings so that instead of being cream or white, they are red.
This "letter" is another that is rarely included in genotype. All non-silver rabbits do not need this included in their genotype in order to let viewer know that rabbit is not silver.
Si: No-Silver - Normal colouring.
si: Silver - Silver-white hairs are scattered throughout normal colouring.
This "letter" is usually only used when refering to breeds Dutch, Dwarf Hotot, and Hotot.
Du: Non-Dutch - Normal colouring.
du(d): Dutch Dark - Dutch markings, mostly coloured rather than white.
du(w): Dutch White - Dutch markings, mostly white rather than coloured.
In order to have a full knowledge of variety of a rabbit, just by looking at genotype, a full genotype, using all of these loci. For example, a Chestnut Agouti would be denoted as A_ B_ C_ D_ E_ enen V_ W_ Si_ Du_. The spaces just mean that a recessive gene could be there, hidden by dominant gene. However, most people know that shortened form of genotype, A_ B_ C_ D_ E_ enen, also means Chesntut Agouti.
Breeder and exhibitor of show rabbits for 11 years, member of the American Rabbit Breeders Association, and fan of all animals.