peripheral serum concentrations of prostaglandin f ( 2 ) alpha metabolite ( pgfm ) , cortisol , and progesterone ( p ( 4 ) ) were determined in cows that retained placentae ( rp ; n = 18 ) and cows that did not retain placentae after parturition ( nrp ; n = 28 ) .
C0242669
retained
C0032043
placentae