Effect of vitamin D on inorganic phosphorus transport and alkaline phosphatase activity of the small intestine of chickens

: Effect of vitamin D on the intensity of inorganic phosphorus absorption and the activity of unspecific alkaline phosphatase in the shick small intestine was studied in vitro on everted gut sacks. Repletion of rachitic chicks with vitamin D3 (500 IU) 72 hrs prior to decapitation enhanced the transport rate 3.5-fold. Concomitantly, the activity of alkaline phosphatase increased 1.8-fold. Analysis of the data obtained shows the important role that the interaction of alkaline phosphatase and inorganic phosphorus transport plays in phosphorus absorption from sources of organic nature.