Merikle Waters Paints & Quarters

Producing & Training Quality Family And Show Horses

Lethal White (Frame) Overo
Information and helpful links

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


The filly above tested to carry frame overo

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.

Frame overo examples

Examples of frame overo at work.

Some with the combination of other genes.

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