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Reprod Nutr Dev. 1995;35(5):475-89.

[Physiology of intestinal absorption of phosphorus in animals].

[Article in French]

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INRA-Theix, laboratoire croissance et métabolismes des herbivores, métabolisme mineral et ostéogenèse, Saint-Genès-Champanelle, France.


Intestinal absorption of inorganic phosphorus. In most mammalian species inorganic phosphorus (P) is absorbed at the duodenal and jejunal level. However in horses some P is absorbed from the large intestine, whereas in ruminant animals some absorption also takes place in the forestomachs. The structure of the putative phosphate-sodium carrier of the brush border from enterocytes still awaits identification. P absorption is modulated both by endocrine (calcitriol, triiodothyronine) and nutritional factors (minerals of the diet, chemical form of phosphorus). Regulation of salivary P secretion, intestinal absorption of P in ruminants, and its adaptation to diets high or low in P are still poorly understood. Such studies would probably help to decrease the cost of P supplementation in farm animals.

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