Fig. 4

Kaplan-Meier curves for heat detection and pregnancy risks (Model 1). Two hundred and twenty-three Polish Holstein cows were examined in the fourth week postpartum and classified as healthy (H; <5% endometrial polymorphonuclear cells [PMN] and no purulent vaginal discharge [PVD]), subclinical endometritis (SE; ≥5% PMN and PVD0), and into distinct PVD categories (PVD1 with flecks of pus, PVD2 with mucopurulent discharge, or PVD3 with purulent discharge, irrespective of endometrial PMN%)