The three studies were conducted to 1) investigate the prevalence of subclinical endometritis (SCE) around breeding and its effect on first service conception rate (FSCR) in dairy cows, to 2) determine the correlation between periparturient serum concentrations of non-esterified fatty acids (NEFA), beta-hydroxybutyric acid (BHBA), bilirubin, and urea and the prevalence CE and SCE and to 3) compare systemic antibiotic treatment of clinical endometritis (CE) in dairy cows with ceftiofur with a treatment protocol consisting of two doses of prostaglandin F2α. For the first study, a total of 201 Holstein- Friesian cows with no signs of CE were examined four hours after first artificial insemination (AI) for signs of SCE. Endometrial samples were...