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An oral drug providing phosphorus and calcium was tested in a field trial in therapy of parturient paresis of dairy cows. Of 180 cows included in this trial, 110 animals were parturient paretic because of deficiency of either calcium or phosphorus or both. The animals were distributed randomly to one of two treatments. Control therapy consists of 500 ml of 24% calciumboro-gluconate and 30 mg dexamethasone, phosphorus therapy consists of control therapy and additional an oral gel providing 45 g phosphorus and 55 g calcium. Serum samples were taken from jugular vein before first treatment for analysis of following parameters: calcium, magnesium, phosphorus, ASAT, CK, GLDH, bilirubin and ß-hydroxybutyrate. There were no significant differences between the both treatment groups in case history, age, or body condition. The parameters in blood serum showed no significant differences with exception of phosphorus. Cows of control group had slight but significant lower phosphorus level than cows of the phosphorus group. In both groups therapy success after first treatment and whole therapy success were very high. Differences were not significant. The oral gel had no greater benefit to paretic cows in this trial. Unsuccsessful treated animals had significant higher levels of CK and ASAT before first treatment.