IONIC HOMEOSTASIS IN RETICULO-RUMEN OF MOOSE AS A FACTOR OF ALIMENTARY ADAPTATION
In this study the results obtained on the daily mineral intake by moose and on the concentration of mineral elements in the reticulo-rumen liquid of moose in summer and in winter months are compared to previous data on reindeer. In both species a great difference in seasonal nutrient consumption is not followed by variation in total mineral elements of the reticulo-rumen liquid. Nutrient homeostasis, particularly of sodium, potassium, phosphates, and nitrogen in reticulo-rumen content in winter is maintained by intensive excretion with saliva and by transepithelial shortchain fatty acid-bicarbonate exchange. The stable level of mineral elements in the reticulo-rumen liquid in winter is necessary for microorganisms and for enteric ion homeostasis. Na+/H+ and K+/H+ Exchange through the rumen wall is a function of alkalinization of the epithelium. It is concluded that the reticulo-rumen in winter is a significant organ for nutrient deposition and its metabolism is a factor in wild ruminant seasonal adaptability.
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