Fig. 2

Milk production trends in Polish Holstein cows classified by Model 1. Trends in milk production for Polish Holstein cows classified by Model 1 from a single dairy, shown overall (n = 223) and categorized by parity (n = 85 primiparous and n = 138 multiparous). Cows were examined in the fourth week post-partum 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, and PVD3 with purulent discharge, regardless of endometrial PMN%). Different superscripts (a and b) indicate a significance level of p < 0.05