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Diminished Hypercalcemic Response to Parathyroid Extract in Prepartum Cows1

Authors
Journal
Journal of Dairy Science
0022-0302
Publisher
American Dairy Science Association
Volume
56
Issue
8
Identifiers
DOI: 10.3168/jds.s0022-0302(73)85302-0
Keywords
  • Research Papers

Abstract

Abstract Parathyroid extract was administered to five cows shortly before and after parturition in addition to postpartal injections only in two other cows. Plasma calcium concentration was measured in each experiment before and after administration of the extract. The postpartal response to parathyroid extract, as assessed by elevation of plasma calcium concentration, occurred more consistently and appeared to be greater than that observed before parturition. The possible mechanisms responsible for diminished prepartal responsiveness and its potential significance in relation to parturient paresis are discussed.

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