Coat types and genetic makeup

The coat is medium-length, dense, and silky to the touch. The Abyssinian, and a similar long-hair breed called the Somali, have coats that are unusual enough to catch attention. These felines owe their special coat to one dominant mutant gene known as Ta. Each hair has a base color with three or four darker-colored bands; the hair is the lighter color at the root, and the darker "ticking" color at the tip. This ticking is found only in the Somali, Abyssinian and Singapura.
The first cat to have its entire genome published was an Abyssinian named Cinnamon.^[5]
The original Abyssinian coat colour is known as 'Usual' in the United Kingdom and as 'Ruddy' elsewhere. The coat has a warm reddish-brown base, with black ticking. The feet and the backs of the hind legs are always black.
Over the years, various other colours have been developed from this original form, but the markings on the coat have remained the same. The back of the hind legs and the pads of the paws are always darker than the rest of the coat. A popular colour is Sorrel, which has a cinnamon (yellowish-brown) base, with chocolate brown ticking, paw pads and backs of the legs. Blue Abyssinians, which have become increasingly popular in recent years, have a light beige base colour with blue ticking, paw pads and backs of the legs. The relatively rare Fawn Abyssinians have a light-cream base colour, with darker cream ticking and warm dark cream pads and backs of the legs.

A six-month old Chocolate Abyssinian (left) with his Sorrel father

Silver Abyssinians are a separate group among the breed. Although this colour has been in existence for decades, it is not recognised by the Cat Fanciers' Association, the world's largest registry of pedigreed cats. In Silvers, the undercoat is always a pure silvery white. The markings include black, blue, warm dark cream and cinnamon. Purely Silver Abyssinians are difficult to breed because they sometimes have undesirable tan patches in the coat. In addition to this, any spots in the coat show up more clearly on a silver coat.
Rare colours include the Tortoiseshell, Red, Cream, Chocolate and Lilac, which are all bred on a small scale in Holland and the UK.
Abyssinian kittens are born with dark coats that gradually lighten as they mature. It usually takes several months for the final coat colour to be established.