Impact of reproductive efficiency over time and mare financial value on economic returns among Thoroughbred mares in central Kentucky.
Authors: Bosh K A, Powell D, Neibergs J S, Shelton B, Zent W
Journal: Equine veterinary journal
Summary
# Editorial Summary Reproductive efficiency directly dictates financial viability in Thoroughbred breeding, yet no prior research had quantified this relationship across mare lifespans and valuations. Bosh and colleagues analysed 1,176 mares' complete production records from central Kentucky to model how reproductive performance, mare value, and investment duration affect net economic return, employing logistic regression to identify factors predicting foal production and calculating net present value across various breeding scenarios. The findings were sobering: 63% of mares failed to produce annually, with a median of 3.4 years before reproductive failure occurred. Advanced age, late foaling dates (after 1 April), requiring multiple matings per season, and a history of reduced consecutive foals all significantly decreased the probability of registered foal production. Critically, the analysis revealed that mares must produce live foals in all but one year over a seven-year investment period to generate positive financial returns—a stringent requirement that underscores the thin margins in commercial breeding. For practitioners advising breeding operations, this research emphasises that mare profitability is fundamentally dependent on consistent annual production, particularly in higher-value animals where positive returns are most achievable. The identification of modifiable risk factors—foaling date drift, repeat mating requirements, and age-related decline—provides actionable targets for reproductive management strategies. Whilst the study's economic assumptions warrant sensitivity analysis in different market conditions, the underlying principle is clear: veterinarians, reproductive specialists and studfarm managers must prioritise interventions that maintain annual conception and live foaling rates to preserve breeding profitability.
Read the full abstract on PubMed
Practical Takeaways
- •Monitor foaling dates annually—progressive delays signal declining reproductive efficiency and should trigger management or culling decisions
- •High-value mares are more likely to generate positive returns despite reproductive challenges; lower-value mares require near-perfect reproductive performance (foals in 6 of 7 years) to be profitable
- •Focus breeding management efforts on improving conception rates and ensuring early-season foaling to maximise cumulative lifetime profitability
Key Findings
- •63% of mares failed to produce a foal every year, with mean time to first failure of 3.4 years
- •Mares showed progressive delay in foaling dates across successive seasons
- •Increasing age, late foaling date (after 1st April), multiple matings required, and lower previous foal production decreased probability of registered foal production
- •Over 7-year investment period, mares must produce live foals in all but one year to achieve positive financial return