Table 3. Plasma concentration of melatonin among different horse ages
1)
Neurotransmitter
Age of horses
1 to 5 years
(n = 5)
6 to 12 years
(n = 11)
More than 13 years
(n = 7)
MEL (pg/mL)
156.6 ± 70.03
127.1 ± 38.32
126.1 ± 47.67
Data represent the mean ± SEM.