Barriers to entering race training before 4 years of age for Thoroughbred horses born in the 2014 Australian foal crop.
Authors: Flash Meredith L, Wong Adelene S M, Stevenson Mark A, Gilkerson James R
Journal: PloS one
Summary
# Editorial Summary Of 13,677 Australian Thoroughbreds born in 2014, only 66% entered race training and 51% actually raced by their 4-year-old season, prompting this investigation into what happens to the remaining third. Researchers surveyed breeders of 1,275 horses that hadn't entered training, achieving a 50% response rate (633 respondents) and identifying their subsequent outcomes. The most striking finding was that 38% of non-starters had died, whilst 24% eventually entered training in their 4-year-old season and 16% were retired—with illness or injury cited as the primary reason across all exit categories, whether horses became breeding stock, were rehomed outside the racing industry, or perished. A critical gap emerged at the point of sale when most foals left their birth premises at 12 months old, resulting in significant loss of traceability through the critical growth and development phase. For equine professionals involved in early-stage Thoroughbred management, these findings underscore the importance of systematic health monitoring and injury prevention in young horses, whilst highlighting that current industry data systems fail to capture what happens to a substantial proportion of the foal crop during the crucial first three years of life.
Read the full abstract on PubMed
Practical Takeaways
- •Nearly one-third of Thoroughbreds never enter training by age 4—illness and injury are the primary preventable causes; early veterinary intervention on breeding farms may improve outcomes
- •Half of horses not in training by age 4 ultimately do race later, suggesting delayed maturation is common and should not trigger premature culling decisions
- •Traceability gaps at yearling sales make it difficult to track outcomes and identify systemic health or management issues on breeding farms
Key Findings
- •Of 13,677 Australian Thoroughbreds born in 2014, only 66% entered race training and 51% raced by age 4
- •Illness or injury was the most common reason horses failed to enter training across all outcome groups
- •Of horses not entering training by age 4: 38% died, 24% later raced as 4-year-olds, 16% were retired
- •Significant traceability loss occurred at point of sale (typically at 1 year of age)