Figure 1

Serum progesterone (ng/ml) (upper panel) and oxytocinase (LNPEP) (U/L) (lower panel) of each individual animal in non-pregnant (n = 5) (grey) and pregnant mares (n = 6) (black) from the Day of ovulation (0) to 22. Differences (p ≤ 0.05) at the various time points between groups are indicated by stars.