Table 2. Mean concentration ± SEM of dopamine by horse age
Age and number of horses
2 to 5 years(n = 6)
6 to 13 years(n = 19)
15 to 24 years(n = 6)
Dopamine (pg/mL)
7.3 ± 2.38
9.0 ± 1.45
10.9 ± 2.31