Competition lifespan survival analysis in the Norwegian-Swedish Coldblooded Trotter racehorse.

This research investigates performance outcomes of the Norwegian-Swedish Coldblooded Trotter racehorses to understand the differences based on their age, sexes, and country of birth. It suggests no negative impact on young trotters involved in racing while highlighting significant discrepancies in career length based on sex, contrasting with prior research on other horse racing breeds.

Study Objective and Methodology

• The objective of the study was to provide a comprehensive analysis of the performance outcomes of Norwegian-Swedish Coldblooded Trotters, examining the differences in their racing careers based on their sex, age at first start, and country of birth.
• For the study, data on 14,548 Norwegian-Swedish Coldblooded Trotters born between 2000 and 2009 was collated. This data included details about each horse’s career length, total career starts, and career earnings. Career length was evaluated through Kaplan-Meier survival curves, segregated by sex, age group, and country of birth.
• To determine factors affecting the rate of retirement from racing, the study adopted a Cox proportional hazards model.

Study Findings

• The equality of career length survival functions exhibited significant differences across factors such as sex, countries of birth, and age at first start. The study noted that an increased age at the first start contributes to a higher chance of retirement from racing.
• Additionally, the study found no harmful effects of racing on young Norwegian-Swedish Coldblooded trotters, contradicting prevalent assumptions about early involvement in racing.
• The study also revealed considerable differences in the career length of horses based on gender, with these variations being the reverse of what was observed in other horse racing breeds.

Conclusion

• The research concludes that factors such as age at first start, sex, and country of birth significantly affect the career length of Norwegian-Swedish Coldblooded Trotters.
• However, the study indicates that the inclusion of additional information, like trainer details and reasons for retirement, could yield even more robust conclusions about these influences.
• Finally, the results challenge the established norms in horse racing, stating that racing young trotters of the Norwegian-Swedish Coldblooded breed presents no adverse effects and exhibits unique career length variations based on sex.