Plasma concentrations of estradiol 17'beta' PGF2'alfa' metabolite and placental fatty acid composition and antioxidant enzyme activity in cows with and without retained fetal membranes - Wischral, A; Nishiyama-Naruke, A; Curi, Rui; Barnabe, R C (Prostaglandins & other Lipid Mediators, 2001)