Equine hospital data as a source for study of prevalence and heritability of osteochondrosis and palmar/plantar osseous fragments of Swedish Warmblood horses.
Authors: Jönsson L, Dalin G, Egenvall A, Näsholm A, Roepstorff L, Philipsson J
Journal: Equine veterinary journal
Summary
Osteochondrosis (OC) and palmar/plantar osseous fragments (POF) represent significant developmental orthopaedic concerns in young horses, yet robust epidemiological data suitable for genetic evaluation and breeding decisions have remained scarce. Swedish researchers analysed radiographic records from 879 prepurchase screening examinations and 3,639 horses presented with orthopaedic problems at a south Swedish hospital, pooling pedigree-linked data from 3,199 individuals to estimate both prevalence and heritability using linear animal model analysis. Overall OC prevalence was 13% across examined joints (stifle 9%, hock 6%, dorsal osseous fragments in the fetlock 10%), with POF occurring in 10% of cases; heritability estimates proved modest on the visible scale (0.05 for OC generally; 0.03 for stifle, 0.08 for hock, 0.10 for DOF, 0.13 for POF), translating to 0.09–0.38 on the underlying quantitative scale—suggesting environmental factors play a substantial aetiological role alongside genetics. The findings validate routine clinical hospital data as a viable resource for tracking inherited developmental problems, though realising this potential will require standardised diagnostic documentation, consistent individual identification via passports or breed databases, and cross-clinic data compilation to ensure adequate progeny representation for meaningful stallion evaluations. For breeding programmes, these heritability figures indicate that whilst selective breeding can modestly reduce OC and POF occurrence, management interventions addressing the substantial environmental component remain equally critical for risk mitigation.
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Practical Takeaways
- •Osteochondrosis and osseous fragments are moderately heritable traits; selective breeding programs should consider these findings when evaluating breeding stock, particularly for high-risk joints like the hock and fetlock
- •Prepurchase radiographic screening remains important as these conditions affect approximately 1 in 8 young horses, with significant variation by anatomical site
- •Standardized diagnostic recording across equine hospitals could improve genetic evaluations and help predict risk in offspring of particular sires
Key Findings
- •Overall prevalence of osteochondrosis was 13% across stifle (9%), hock (6%), and fetlock (10%) joints in Swedish Warmblood horses
- •Palmar/plantar osseous fragments occurred in 10% of the study population
- •Heritability of osteochondrosis ranged from 0.03 (stifle) to 0.13 (POF) on binomial scale, corresponding to 0.09-0.38 on underlying quantitative scale
- •Equine hospital data provides a reliable source for epidemiological and genetic evaluations of inherited skeletal disorders when standardized documentation and pedigree information are available