Fig. 5

Kaplan-Meier curves for heat detection and pregnancy risks (Model 2). Two hundred and twenty Polish Holstein cows were examined in the fourth week postpartum and classified as healthy (H; <5% polymorphonuclear cells [PMN] and no purulent vaginal discharge [PVD]), subclinical endometritis (SE; ≥5% PMN and ≤ PVD1), and clinical endometritis (CE; ≥5% PMN and > PVD1)