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Related Experiment Videos

Neonatal isoerythrolysis in mule foals

J L Traub-Dargatz1, J J McClure, C Koch

  • 1Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins 80523.

Journal of the American Veterinary Medical Association
|January 1, 1995
PubMed
Summary

Mule foals receiving antibodies from colostrum can develop anemia or thrombocytopenia due to incompatible blood types. This study identifies a unique donkey antigen causing mare sensitization during breeding.

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Area of Science:

  • Veterinary Medicine
  • Immunology
  • Reproductive Biology

Background:

  • Neonatal isoerythrolysis (NI) is a condition where a dam's antibodies attack the neonate's red blood cells (RBCs).
  • This can occur in horses when mares are exposed to fetal RBC antigens inherited from the sire, typically during a previous pregnancy or mating.

Observation:

  • Four mule foals ingested colostrum containing anti-RBC antibodies from their dams.
  • Two foals developed anemia, one severe thrombocytopenia, and one showed no adverse effects.
  • Seven mares bred to a specific donkey sire produced anti-RBC antibodies, with two showing sensitization after the first mating.

Findings:

  • A donkey sire possessed a unique RBC antigen, also found in its offspring, which is specific to donkeys and mules.

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  • This antigen caused incompatibility in all matings between this donkey sire and horse mares.
  • Mares bred to this donkey sire exhibited a high rate of sensitization to the donkey RBC antigen.

    • Implications:

    • Identifies a specific RBC antigen in donkeys that poses a risk for neonatal isoerythrolysis in mules.
    • Highlights the importance of blood type compatibility in equine breeding, particularly with donkey-horse crosses.
    • Suggests further research is needed to understand the mechanism behind the high rate of mare sensitization to this antigen.