​Eye Colour the P locus.
This is as much for my benefit as anyone else's!
The pink eye gene affects coat colour also.
In order of dominance;
P = normal eye colour and coat colour (black BB and chocolate bb)
pg (grey) = dilutes black coat by approx. 50% to grey and produces a ruby cast to the eye (black becomes slate and chocolate becomes caramel).
p = pink eye dilution further dilutes black by approx. 80% (black becomes lilac and chocolate becomes beige)
The ruby cast to some dark-eyed cavies can be caused by any of several dilution genes = Pp, genotypes Bb or bb or any visible or hidden cr.  

​​The C & E Locus
The different alleles of the C series affect the colour dilution.
C is full colour, no dilution on either black or red.
cd is light dilution. Black slightly but red is diluted to buff  (possible slight eye ruby cast)
cdch creates cream.
cr is ruby eye dilution. Red coat is diluted to white - DE White, a golden agouti becomes a silver agouti. Black barely diluted. Very dark ruby eyes.
ch (Himi*) Stops all red but as with the rabbits the black is temperature sensitive. chch = PE White
crch = sable

E is the Extension gene either allows or suppresses the black pigment (so allows red to show through)
E allows black throughout the coat.
ep is partial expression of the black in marked varieties like tortoiseshell and brindle (black and red patches).
e is non extension and only allows a small amount of black.
Himi* carry EE which allows the extension points.

Note! I Need to make sense of the sable gene. Black sable aaBBcrca (where ca is Himalayan)EEPP
crch black, lilac, beige, silver fox, silver agouti, magpie, cali..born lighter cdch = sepia. Cali markings will disappear on sables. cdca? sable is pointed sepia - darker tip to hair....
Still learning sable as they do not work the same way as in the rabbits.. further notes here after creating more sables in 2025!
Sable and Sepia are a result of interactions between some of the Chinchilla series genes, e.g. Himalayan and Silver or Himalayan and Buff, when ee yellow is not present.
If the cinnamon agouti sow (mum) never produced sable with several other crcr boars then the current used boar must be crca/crch(sable combination) himself.
Sables are crch so any colour without those dilutions would give you non sables but any time you use a sable he/she can pass on the ch gene. You can usually spot a sable with PP by looking at the eye colour and the change in coat colour. But when they are also cali it can be difficult.
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