钙对奶牛肾脏镁保留的影响。
Calcium effects on renal conservation of magnesium in cows.
作者信息
Halse K
出版信息
Acta Vet Scand. 1984;25(2):213-28. doi: 10.1186/BF03547266.
Abstract
Urinary excretion rates for Ca, Mg and P were compared to simultaneous measurements of the same elements in blood plasma of cows recovering from moderate hypocalcaemia post partum and in 1 animal during recovery from hypocalcaemia induced by fasting. The renal conservation of Mg was found to be increased during the hypocalcaemia, theoretical tubular reabsorption rates being correlated to plasma Ca with r = –0.7, P < 0.001. The relationship was observed in the plasma Ca range from about 2.0 to 2.6 mmol/1. The findings may explain the occurrence of hypermagnesaemia in hypocalcaemic cows and the delay in the development of hypo-magnesaemia seen in cows with fasting-induced hypocalcaemia.
摘要
将产后中度低钙血症恢复过程中的奶牛以及1头因禁食诱导低钙血症恢复过程中的动物血浆中钙、镁和磷的含量与同时测量的尿排泄率进行了比较。发现在低钙血症期间镁的肾脏保留增加，理论肾小管重吸收率与血浆钙相关，r = -0.7，P < 0.001。在血浆钙范围约为2.0至2.6 mmol/1时观察到这种关系。这些发现可能解释了低钙血症奶牛中高镁血症的发生以及禁食诱导低钙血症奶牛中低镁血症发展的延迟。
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