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  • Title: An evaluation of the copper sequestrated during clotting in cattle: is it just caeruloplasmin?
    Author: Laven RA, Lawrence KE, Livesey CT.
    Journal: Vet J; 2008 Jun; 176(3):397-9. PubMed ID: 17509916.
    Abstract:
    In cattle, sequestration of copper (Cu) occurs during the clotting process so that serum Cu concentrations are markedly lower than plasma Cu. It has been suggested that all of the Cu lost during clotting is caeruloplasmin (CP). This study used paired samples from 125 cattle to assess whether this assumption was correct. The regression equations for plasma CP activity against plasma Cu concentration and serum CP against serum Cu had significantly different intercepts suggesting that at zero CP activity the amount of Cu remaining was dependent on sample type. Furthermore, the difference between serum and plasma Cu was unrelated to Cu status, whereas the difference between serum and plasma CP was related to Cu status. The regression equation for the loss of CP activity against change in Cu concentration had an intercept that was different from zero, indicating that a reduction in Cu concentration could occur even if CP activity was unaffected by clotting.
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