This is part of a multi-page html document by Bonnie Dalzell, © 1997

A locus red a-y a-y or a-y a-?

The a-y gene on the a locus is associated with intensification of color on the dorsal portion of the animal and paling on the ventral portion, muzzle, cheeks, inside of ears and lower legs and feet. However the demarcation between the dorsally promoted portions and the lighter ventral portions is not as marked as in a-t. Various degrees of scatterd black hairs will be seen in the dorsally promoted regions on a-y dogs but they are never as strongly bicolored as a-t dogs. A-y dogs may 'sable in' with age getting more black in the coat. A-t dogs tend to loose color with age.

In a-y reds eumelanine bearing hairs are restricted in location to the dorsal portions of the body and eumelanine is restricted to a band on the tip of the hairs but the black pigment is not diluted or paled.

a-y reds have black noses, eye rims and lips unless there is some dilution gene present to pale out the eumelanine. a-y reds are most commonly confused with the intensified e-locus red seen in irish setters and a few other breeds.

If dominant black really is an A locus gene then it is dominant over a-y, otherwise a-y is the most dominant gene on the A locus.

On the left is a year old male Borzoi with fairly strong contrast between the dorsal portions of the pattern and the ventral portions. He has a good scattering of black hairs in the dorsal portions of the head, neck and body (termed sabling). On the right is a 2 year old Borzoi female 'clear red' a-y a-? with few black hairs on the head and body. Black hairs still occur around the ear edges and along the dorsum of the tail.

two ay red borzoi

A sampling of Breeds in which a-y is common.
Collie breeds
Whippet and Greyhound
reds, shaded reds

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