Abstract
Concentrations of PGFM[13,14-dihydro-15-keto-prostaglandin F2.alpha.] in blood and milk of 28 Murrah buffaloes increased significantly (P < 0.001) in non-pregnant animals before estrus but not in pregnant animals. The PGFM level in milk was similar to that in blood plasma and was positively correlated in non-pregnant (r = 0.981) and pregnant (r = 0.521) animals. Mean blood plasma PGFM concentration was not significantly (P < 0.05) different from that of milk.