Exercise in Thoroughbred yearlings during sales preparation: a cohort study.

This research investigates the impact of early exercise on the musculoskeletal development of Thoroughbred yearlings during sales preparation, highlighting significant differences in exercise regimes across and within farms and the prevalence of lameness as a common health issue.

Methodology of the Study

• The researchers conducted a cohort study to gather data on the exercise regimes and health conditions of Thoroughbred yearlings gearing up for sales.
• They collected information from 18 farms across New Zealand, with daily exercise activities of individual horses recorded during the farms’ sales preparation period for the annual national yearling sales in 2009.
• A total dataset for 319 yearlings was generated; the data included whether the yearlings were involved in exercise (hand walking, mechanical walker and lungeing) during preparations for their sale.

Results of the Study

• Nearly 89% of the yearlings (283 out of 319) participated in exercise during the sales preparation period, which typically lasted around 69 days.
• There were noticeable differences in duration of exercise by gender, farm, and month of the preparation, but the type of sale or category of sales price did not significantly affect the median exercise time.
• Further, within certain farms, variance in daily exercise between horses was also observed as well as the total exercise amount when comparing male and female horses and the number of days spent in the sales preparation.

Health Problems during Sales Preparation

• The research revealed that lameness was the most common health problem encountered by yearlings. The overall incidence rate of lameness was 0.08 per 100 horse days.
• The occurrence of lameness varied noticeably between the farms, but factors such as age, sales type, or the month of the preparation did not significantly affect the incidence rate.

Conclusions of the Study

• The research concluded that exercise programs for yearlings preparing for sales differed not only across different farms, but also within the same farm between individual horses.
• Considering that exercise routines are already individually tailored, there seems to be an opportunity to modify sales preparation routines with a specific focus on each horse’s future career.