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Area of Science:

  • Equine reproduction
  • Animal genetics
  • Veterinary science

Background:

  • Genetic testing is standard for foal registration in most equine breeds.
  • Accurate parentage verification is essential for breed registries and genetic management.

Observation:

  • Two clinical cases involving equine embryo transfer presented with delayed embryonic development or fertilization.
  • Donor mares were inseminated with semen from different stallions in consecutive cycles.

Findings:

  • DNA parentage testing revealed that the sire of the foals was from the earlier insemination cycle, not the later one.
  • This indicated a significant delay in fertilization or embryonic development, or extended sperm viability.

Implications:

  • The study highlights the importance of genetic testing for definitive parentage assignment in horses.
  • Breeding records alone can be misleading due to rare reproductive phenomena like delayed fertilization.
  • These findings have implications for equine breeding programs and genetic management strategies.