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The study aimed to explore the cause of retained fetal membranes in cows after delivery. The studied cows divided into 2 groups, each group was (15) cows different in age and weight, the times of collection of serum (1-3) days after parturition. The first group suffered from retained placenta (RP) after delivery and the other group was normally delivered.The parameters that studied was serum blood sugar,calcium (Ca), sodium (Na), potassium (K), in addition to total protein, albumin and globulin. The result of this study wassignificant (p≤0.05) increase of serume glucose, potassium (K), and sodium (Na) in (RP) group in comparison to control group and significant(p≤0.05)decrease of serum calsium (Ca), total protein, albumin and globulin in (RP) group when compared with control group that mean retained placenta take place in cows sufferes from decrease serum calsium (Ca), total protein, albumin and globulin.