Preliminary Examination of the Biological and Industry Constraints on the Structure and Pattern of Thoroughbred Racing in New Zealand over Thirteen Seasons: 2005/06-2017/18.
Authors: Legg Kylie A, Gee Erica K, Cochrane Darryl J, Rogers Chris W
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Over thirteen seasons (2005/06–2017/18), researchers analysed 388,964 flat racing starts in New Zealand to map how the Thoroughbred racing industry has evolved under biological and economic pressures. Despite a steady 2–3% annual decline in race offerings, horse entries, and available starts, the industry responded by extending racing careers—particularly for fillies aged 2–4 years, who experienced an additional preparation per season post-2008—resulting in more cumulative starts per horse across a lifetime. Critically, biological constraints appeared to limit career intensity: the number of starts per preparation and inter-preparation recovery periods remained unchanged despite the structural shifts, suggesting horses have fundamental physiological limits that industry-level reorganisation cannot overcome. The research reveals that approximately 14% of new racing entrants continued having only single race starts, implying consistent selection criteria for racing suitability regardless of broader market contraction. These findings establish quantifiable baseline metrics for the racing population, offering veterinary professionals, physiotherapists, and industry stakeholders a framework to predict how intervention strategies—whether targeted rest protocols, preparation modifications, or entry criteria—might alter injury risk and economic sustainability without overshooting biological capacity.
Read the full abstract on PubMed
Practical Takeaways
- •Racing careers are extending in duration but not intensity per season—expect horses to race longer but with similar workloads per preparation, requiring adjusted long-term conditioning and injury prevention strategies
- •The aging racing population and increased filly participation may require tailored management protocols; monitor preparation gaps between racing blocks as they remain stable despite career length changes
- •The 14% single-start failure rate is consistent across time, suggesting current selection methods work; focus injury reduction efforts on improving conditions for horses that do compete rather than changing entry criteria
Key Findings
- •New Zealand Thoroughbred racing experienced a 2-3% annual reduction in races, starts, and horse numbers over 13 seasons (2005/06-2017/18)
- •Fillies aged 2-4 years showed increased race participation and longer careers following addition of one extra racing preparation post-2008
- •Mean race starts per season and per preparation remained unchanged despite longer career durations, suggesting biological constraints limit annual racing intensity
- •Consistent 14% single-start rate among new entrants indicates stable industry screening practices for racing suitability