Table 1. Characteristics of animals used in this study

Animals	HJ	LJ	HT	LT
n (male/female/gelded)	13 (2/9/2)	17 (5/5/7)	9 (4/3/2)	10 (4/6/0)
Age (year)	5.3 ± 1.4	3.7 ± 1.2	4.9 ± 1.5	4.2 ± 0.6
Body weight (kg)	312.6 ± 9.6	303.7 ± 12.3	450.9 ± 8.5	446.2 ± 10.7

HJ, high-performance Jeju horses; LJ, low-performance Jeju horses; HT, high-performance Thoroughbreds; LT, low-performance Thoroughbreds.