[Cationic hydrogen exchanges in the reticulo-rumen and their significance in ruminants].
Up-to-date experimental results on mechanisms and physiological significance of mineral cations absorption in the reticulo-rumen of ruminants are observed in the review. Up to 90% of sodium, 100% of potassium and calcium and about 30-60% of magnesium pass across epithelium of the reticulo-rumen of domestic ruminants by electroneitral way through cation per hydrogen exchanges. In wild ruminant (reindeer) the item for sodium is up to 100%. Intracellular hydrogen ions are available due to carbonic anhydrase I function. The exchanges have great significance for the animals. The first, their organisms get cations mainly by metabolic products using. The second, hydrogen ions excretion is necessary for reticulo-rumen epithelial cells successful proliferation. The third, hydrogen ions excretion may be considered as a excretory mechanism of metabolic acidosis compensation in the digestive tract of ruminants. These moments may be observed as physiological mechanisms of adaptation of wild ruminants to seasonal dynamic of nutrition.
Chalyshev
A V
AV
Institute of Physiology, Komi Science Centre, Ural Division of the RAS, Syktyvkar.
D000818:Animals; D002412:Cations / Q000378:metabolism*; D006859:Hydrogen / Q000378:metabolism*; D012417:Rumen / Q000378:metabolism*; D012418:Ruminants / Q000378:metabolism*
D002412:Cations; D006859:Hydrogen