While the precise genes that cause sooty are not known at this point it is believed to be genetic in origin with more than one gene playing a part as a modifier of coat color. The other two, mahogany and liver, are shade terms and shade can be effected by many things but red is red is red genetically. They are all ee. Bays (which have red bodies with restriction of placement of black to points) are going to be E_A_ and again the shade of the red is not determined be the base genes but by other factors. It is possible there is a genetic component specifically but that has not been determined. We do know mineral deficiencies, (I suspect) toxicities, exposure to weather or sweat and other genes that modify can be a determining factor of shade. So does season. Fade which is genetic (degree of fade) as well as environmental also effects shade.
Some horse people change their horse, they change their tack and discipline, they change their instructor; they never change themselves.
Last edited by QtrBel; 01-19-2020 at 01:42 PM.