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    The rumen and potassium homeostasis: a model (2007)

    Art
    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Autoren
    Stumpff, F.
    Martens, H.
    Quelle
    Journal of animal and feed sciences : a scientific journal of the Polish Academy of Sciences; 16(2) — S. 436–441
    ISSN: 1230-1388
    Sprache
    Englisch
    Kontakt
    Institut für Veterinär-Physiologie

    Oertzenweg 19 b
    14163 Berlin
    +49 30 838 62600
    physiologie@vetmed.fu-berlin.de

    Abstract / Zusammenfassung

    The ruminant has to be able to regulate potassium over an extremely wide range of intake. When related to bodyweight, dietary potassium intake of ruminants frequently exceeds that of humans by a factor of over ten, and experimental situations suggest that the toxic threshold for ingestion of potassium is considerably higher. While a number of studies have addressed the outstanding ability of the ruminant kidney to extrude potassium, the role of the rumen in maintaining potassium homeostasis in sheep and cows by serving as a reservoir for the redistribution of potassium has received considerably less attention. Based on current and past studies at the level of the cell, the tissue and the animal, we present a model for the regulation of ruminal transport that may help in the understanding of the variable responses of the rumen epithelium to dietary potassium intake, and the role of magnesium in mediating these responses.