Table 1 Significance (p) values from 24-hour Cosine fits to melatonin (MEL) and cortisol (Cort) time series for individual mares during LD and DD and for corresponding group means (12 points/fit).

Mare 1

.013

.01

.6

.07

Mare 2

.0038

.1

.21

.37

Mare 3

.002

.83

.2875

.2858

Mare 4

.036

.07

.7436

.7473

Mare 5

.0016

.22

.53

.11

Mare 6

.0015

.016

.2

.002

Group Mean (n = 6)

.00026

.51

.076

.005