



TsTs/tsts
There are kind of 2 versions of tortoiseshell: tortoiseshell and calico
Tortoiseshell is the most complicaties cat gene. This gene places black markings on the horse. on a horse with no paint markings(tobiano for example) are the markings smaller and more irregular. You'll never see tortoiseshell marking with crisp clean lines if there is no paint marking. if there is a paint marking then the horse is called a calico. the tortoiseshell markings are bigger and much less irregular then. the mane turns black when touched by a marking. This marking is also rarely seen on stallions, tortoiseshell on a stallion is as rare as chimera.
also the phenotype of a calico horse is written as the following:
calico(paint markings)
example:
right:
bay Calico (splash)
palomino Calico (tobiano, overo) snowcap appaloosa with birdcatcher spots
wrong:
bay tortoiseshell overo
black calico
chestnut sabino calico
splash,overo,sabino and tobiano are paint markings. Appaloosa is not!