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Differences between horse selection based on two forms of osteochondrosis in fetlock.

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Genome-wide association studies reveal distinct genetic backgrounds for osteochondrosis (OC) and osteochondrosis dissecans (OCD) in horses. Defining these conditions precisely is crucial for effective breeding and veterinary practices.

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GWASHorseOsteochondrosis definitionSelection

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Area of Science:

  • Equine genetics
  • Animal breeding
  • Veterinary orthopedics

Background:

  • Osteochondrosis (OC) and osteochondrosis dissecans (OCD) are significant health issues in horses, impacting their athletic potential.
  • Current breeding strategies for managing OC/OCD are limited by inconsistent definitions and unclear genetic usefulness.
  • Accurate genetic assessment is vital for improving equine health and performance.

Purpose of the Study:

  • To compare the genetic background of osteochondrosis in Warmblood horses using two distinct phenotyping scales: osteochondrosis (OC)/healthy and osteochondrosis dissecans (OCD)/healthy.
  • To identify single nucleotide polymorphisms (SNPs) associated with OC/OCD using genome-wide association studies (GWAS).
  • To evaluate the impact of differing disease definitions on genetic risk assessment in equine populations.

Main Methods:

  • Phenotyped and genotyped 201 Warmblood horses (87 stallions, 114 mares) using BeadChip 70K.
  • Collected and analyzed four fetlock X-ray images per horse.
  • Applied Cochran-Armitage test and logistic regression to identify significant SNPs associated with OC/OCD status.

Main Results:

  • The OCD/healthy scale identified a higher number of significant SNPs (16) associated with osteochondrosis, primarily on ECA1 and ECA10.
  • The OC/healthy scale identified fewer significant SNPs (2 on ECA15, 1 on ECA10).
  • Suggestive SNPs were identified as potential markers, but require validation in larger populations.

Conclusions:

  • The genetic underpinnings of osteochondrosis and osteochondrosis dissecans appear to differ.
  • A precise and standardized definition of osteochondrosis is essential for both breeding programs and veterinary diagnostics.
  • Identified SNPs warrant further investigation as candidate markers for equine osteochondrosis.