Appearance

Also known as Somatic, occlusion appears as natural-looking areas where one or multiple genes have been fully or partially "switched off". If a gene has been fully occluded then it is essentially "hidden" and does not show at all.

When a horse has the occlusion trait you are free to chose which genes are occluded, and to which degree. Multiple genes can be occluded at the same time, including the extension gene (EE, Ee, ee), which means a chestnut (ee) can have black spots, a black (Ee or EE) can have chestnut spots, and different bay variations can have occluded red pigment resulting in black areas, or occluded black pigment resulting in chestnut areas.

Essentially, occlusion only turns off genes (fully or partially), it doesn't turn on genes that aren't already present.

Affects hoof, horn, and eye-color when possible, for example a cremello which has blue eyes and light hooves/horns will have brown eyes and dark hooves/horn in occluded spots.