Foal with Overo lethal white syndrome born to a registered quarter horse mare.

The research article discusses a case of a 16-hour-old white foal born to a registered quarter horse mare, who was diagnosed with Overo lethal white syndrome, a condition causing ileocolonic agangliosis, confirmed via DNA testing. Unable to be treated, the foal was euthanized.

Introduction

• The research document details a case study of a newborn white foal, who is just 16 hours old, afflicted with Overo lethal white syndrome (OLWS), a lethal condition that is unfortunately untreatable currently.

Case Overview

• The foal was born to a registered quarter horse mare and began showing signs of colic shortly after its birth, which precipitated an examination.
• Colic in foals can indicate a range of health issues, in this particular case, it served as a sign of the presence of Overo lethal white syndrome.

Diagnosis

• The diagnosis of Overo lethal white syndrome was confirmed through DNA testing.
• OLWS is a condition that causes ileocolonic agangliosis – an absence of cells known as ganglia in a section of the intestine, which results in the inability of that part of the intestine to function properly.
• The disorder commonly leads to severe colic and other health complications in foals and is most often fatally inherited from parents carrying the defective gene.

Treatment and Outcome

• Considering that there currently exists no cure or treatment for Overo lethal white syndrome, the decision was made to euthanize the foal.
• This decision is typical in such cases, given the severity of the symptoms, the unremitting pain associated with the syndrome, and the lack of any known curative therapies.

Summary

• The case study provides valuable insight into the genetic disorder Overo lethal white syndrome, which predominantly affects foals of certain horse breeds.
• The study highlights the urgent need for further research into potential treatments and prevention techniques for this deadly syndrome.