Horm Metab Res 1972; 4(4): 300-303
DOI: 10.1055/s-0028-1094072

© Georg Thieme Verlag KG Stuttgart · New York

Calcium Homeostasis in the Normal and Thyroidectomized Bovine

J. P. Barlet
  • I.N.R.A. - Theix, St-Genès-Champanelle, France
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Publication Date:
07 January 2009 (online)


In three thyroidectomized mature dairy cows daily intramuscular injection of a very small dose of vitamin D3 (200,000 u/day/animal for six days) induced a slight but significant hypercalcemia and hyperphosphatemia which did not appear in three control cows. In three thyroidectomized steers, a physiological dose of parathormone (40 ng/min/kg for 7 hrs) or a very slight increase in daily calcium intake (40 gm/day/animal) induced a highly significant increase in plasma calcium: similar treatments had no effect on the calcemia of control steers.