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Calcium Effects on Renal Conservation of Magnesium in Cows
Innvirkning av kalsium på nyrekonserveringen aν magnesium hos kyr.
Acta Veterinaria Scandinavica volume 25, pages 213–228 (1984)
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.
Sammendrag
Mengder av Ca, Mg og Ρ utskilt per tidsenhet med urinen ble sammenholdt med samtidige konsentrasjoner av de 3 elementer i blodplasma fra kyr i løpet av normaliseringsperioden etter moderat hypokalsemi post partum og i et tilfelle etter fremkalling av hypokalsemi ved faste.
Nyrekonserveringen av Mg viste seg å vaere økt under hypokalsemi. Teoretiske tubulære reabsorpsjonshastigheter for elementet var korrelert til plasma Ca (interval ca. 2.0–2.6 mmol/1) med r = – 0.7, Ρ < 0.001.
Funnene kan forklare forekomsten av hypermagnesemi hos hypokalsemiske kyr og forsinkelsen i utviklingen a v hypomagnesemi hos kyr med hypokalsemi etter faste.
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Halse, K. Calcium Effects on Renal Conservation of Magnesium in Cows. Acta Vet Scand 25, 213–228 (1984). https://doi.org/10.1186/BF03547266
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DOI: https://doi.org/10.1186/BF03547266