Chinspots on Clydesdales
One Sabino characteristic is a white marking on the face
which can vary from a few white hairs to a large blaze. Anoter
very common characteristic of Sabino is white on the lower
lip and/or chin, ranging from small to large. Some very minimal
Sabinos may not have this characteristic white spotting but
will have other traits of the pattern. Even though facial
white is common, even to the point of causing a "bald"
or "apron" marking at times, blue eyes not considered
a trait of the pattern and if it does occur in conjunction
with Sabino it is usually a trait of a certain line of horses
and these horses usually only have one blue eye, not two.
(The Khemosabi line in Arabians is very prevalent with Sabino,
some of which have blue eyes), or it is being caused by another
Leg white that ranges from a coronet to a high stocking is
also common. There really is no rule as to how many legs are
white, but generally at least one will have some white on
it. Patches on the knees, that are not connected to any other
white, are also a trait that can occur with Sabino.
Roaning on a Miniature Horse
Another common characteristic of Sabino is roaning, this
is the most minimal expression of Sabino. This can vary from
a small amount of roanin concentrated in an one area of the
horse to roaning that covers the entire body. It's also common
for roaning to be found on the head and legs, especially if
a white marking is present. This roaning will vary in extent
from very minimal to very extreme and occurs to some extent
in all breeds which have Sabino.
Body spotting is can range from very minimal that usually
begins in the belly area to maximum effects involving the
entire body. The minimal expressions can be seen as roaning,
to speckled areas to larger white patches. Most Sabinos are
flecked or roan and this is especially true when a horse has
extensive spotting. Towards the more maximum expression of
the pattern, some Sabinos can look very similar to Splashed
Whites, the difference being that Sabinos generally have some
roaning to the edges of their white. Splash spots (without
Sabino present) should be crisp and clean.
Heisler's Toyland Reba
Courtesty John Heisler
Photo ©Equine Color
Sabino can also cause roaned areas that may not be present
at birth and grow with age. The mare to the left is a yearling
in the photo, in January 2002 there was no indication that
there would be any kind of white marking in this location.
As she shed her winter hair the spot appeared and kept getting
larger and larger. This photo was taken in June 2002. She's
also developing slight roaning on her side and back. The mare
is a minimal Tobiano that has no body spotting (other than
the roaned spot) no facial white and 3 small socks with ermine
spots. Her coat color is Silver Bay.
At it's most maximum expression Sabino will cause the horse
to be totally white, if any color remains it's usually as
roan or speckled on areas such as the ears, tail base, chest
and flanks, these areas may not have colored hair, it may
just be the
colored skin showing through the white hair. In the past,
a horse colored like this was said to be "Dominant White".
This dominant gene, labled W, was thought to be lethal when
homozygous, like Frame. The problem with this theory was that
many horses who were "Dominant White" didn't have
the necessary "Dominant White" parent, the rule
of dominant genes being that at least one parent must have
it for the foal to have it. Research has shown that these
"Dominant White" horses who
are usually born from non-white parents are really Sabinos
with the maximum expression of the
pattern. The theory of the "Dominant White" gene
has been left in the past, especially since there has never
been any scientific evidence to support that it exists.
Sabino is the most common cause of solid colored horses with
"chrome" or horses that have lots of facial white
and high leg white but no body spots, although it's common
to see small to large belly spots. These horses are thought
to be "solid" with "normal" white markings,
but are in fact Sabinos and depending on the horse they are
mated with they could be just as likely to produce a Sabino
foal as another Sabino with more pattern expressed. An example
of this is the many Quarter Horses that are minimal expression
Sabinos, these horses can and do produce full patterned "Paint"
foals that are called "crop-outs". Sabino also very
commonly mixed with Frame and Splashed White in Miniature
Horses, American Paints and Pintos.