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Effect of synthetic bovine parathyroid hormone in dairy cows: prevention of hypocalcemic parturient paresis


Effect of synthetic bovine parathyroid hormone in dairy cows: prevention of hypocalcemic parturient paresis



Journal of Dairy Science 69(9): 2278-2289



ISSN/ISBN: 0022-0302

PMID: 3782584

DOI: 10.3168/jds.s0022-0302(86)80666-x

Intravenous infusion of synthetic bovine parathyroid hormone for 96 h increased 1,25-dihydroxyvitamin D, Mg, Ca, and hydroxyproline in plasma of pregnant cows within 16, 24, 48, and 72 h, respectively. Plasma Ca concentration was maximal at the end of the 96-h infusion (15.1 mg/100 ml). Plasma concentration of 1,25-dihydroxyvitamin D at 96 h was twice that before parathyroid hormone infusion, indicating that parathyroid hormone stimulated 1,25-dihydroxyvitamin D production in the presence of hypercalcemia. The urinary excretion of hydroxyproline indicated that at least 48 h of parathyroid hormone stimulation was required to stimulate bone resorption in the pregnant cow. Eight periparturient cows were on a high Ca diet prepartum. Four cows were treated with intravenous parathyroid hormone prior to parturition. Four cows were untreated. All four untreated cows developed parturient paresis. None of the cows treated with parathyroid hormone developed parturient paresis. However, two cows that received parathyroid hormone for less than 24 h prior to parturition became hypocalcemic, but not recumbent. Plasma Ca concentrations remained within normal limits in the two other cows that received greater than 60 h parathyroid hormone infusion prior to parturition. We conclude that exogenous parathyroid hormone (1-34) can prevent parturient paresis if administered at least 60 h prior to parturition.

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Accession: 005274265

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