Avoiding Lethal Whites - The Horse Forum
  • 7 Post By DraftyAiresMum
  • 1 Post By JetdecksComet
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post #1 of 3 Old 08-07-2014, 02:29 PM Thread Starter
Join Date: Aug 2013
Location: Seattle, WA
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Avoiding Lethal Whites

My trainer today was talking to me today about Lethal White foals during a group lesson. So I know what they look like and that they die soon after birth, but I was wondering what causes foals to be Lethal White and how you can avoid it when breeding.

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post #2 of 3 Old 08-07-2014, 02:35 PM
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Testing for the frame overo gene (also known as the OLWS or LWOS gene) can prevent a lethal white foal.

Lethal whites (or LWOS/OLWS) foals are created when you breed two horses who are positive for frame together. When you do this, you have a 25% chance of creating a lethal white foal.

Because white patterns can hide (one member has a mare with a small star as her only white, yet she tested positive for frame), it's important to test any horse you suspect of carrying frame before breeding.
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post #3 of 3 Old 08-10-2014, 10:12 AM
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I'd go a step farther and say to test ANY horse, not just ones you suspect, if it is a breed that has shown to carry LWO. If either horse tests negative, then you can breed without fear of a lethal white foal.
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