Risk factors for the hazard of lameness in Danish Standardbred trotters.

The study investigates the incidence of health problems interrupting the ideal training schedule for Danish Standardbred trotters and identifies association of lameness with certain risk factors such as age, trainer, gender, duration with trainer and participation in races.

Study Design and Population

• The research carried out is a follow-up study on Danish Standardbred trotters, including data from 265 horses.
• The data was gathered over a period of five months in 1997 and 1998.
• The focus was on horses that were at least two years old and their training period was tracked.
• Optimal training was defined as a period where the horses underwent scheduled instruction that included fast-speed trotting.
• Any interruption in this training was considered to be caused by health issues and castration.

Findings of the Study

• A total of 123 instances of training interruption due to health problems were reported.
• Lameness was the most common cause of training interruption, with a total of 84 instances reported in 69 horses.
• The second and third most common causes of training interruption were respiratory diseases (16 instances) and muscle problems (7 instances).

Effect of Various Factors on Lameness

• A multivariable Cox proportional-hazard model was used to estimate the effects of several factors on the likelihood of lameness. These factors included the trainer, gender of the horse, age group of the horse, duration with a trainer, participation in races, and the current month of the year.
• The effects of the trainer, gender, and age group were treated as time-independent variables, while duration with a trainer, participation in races, and current month were treated as time-dependent variables.
• The study revealed that the trainer had a significant impact on the hazard of lameness in the horses. Horses trained by certain trainers were more likely to experience lameness than others.
• Geldings (castrated males) and younger horses (3-year olds compared to those over 4 years old) showed a higher likelihood of lameness.
• Horses that had recently entered a training regime (1.5-2.5 months into the training) were found to have a higher risk of lameness compare to those who had been with the same trainer for over three months.
• Participation in races also significantly increased the hazard of lameness, especially within the 5 days following a race.