We have provided some helpful links for those
of you who want to learn about this gene.
Millenium Miracle & Tristans Millenium both carry
the "lethal white overo gene", which is also
responsible for their beautiful coat
patterns. When they are crossed with another
carrier of the gene, there is a 25% chance
they will produce a lethal white foal (Always
ending in death). With Millenium Miracles color
rate, as well as his large amount of frame
patterned progeny, if you choose to take a
gamble your odds getting a lethal white when
breeding a frame carrying mare is about 75%.
We do not reccomend you take the risk,
testing to be sure of your mares frame overo
status is cheap easy insurance.
It is important to know that this is NOT a disease
or defect. It is a color gene that only produces
color when in heterozgous form (one copy).
Only if Sire and Dam both have the gene, and
BOTH pass on the gene does it result in a
Lethal White Foal. Due to frame overo having
varying pattern expressions, a "solid" or a
tovero can carry frame as well. We
reccomend testing on all quarter horse mares,
breeding stock paints along with regular
registry. The frame pattern is also in
thoroughbred lineage, and while less common
can be a risk as well.
We feel that it is an individual choice and want to
provide you with the best information available.
Please visit the following links and if you have
further questions or concerns, contact us
Frame overo hides well within the tobiano
pattern, often going unnoticed even after
registration with APHA. It is good to keep in
mind how many horses are registered as the
wrong pattern. This leaves potential for
"tobiano" horses, despite a pedigree full of
tobiano horses, the potential of carrying frame
overo as well.
Test your mare! Animal Genetics
Examples of frame overo at work.
Some with the combination of other genes.