Studies on the Intestinal Absorption and Excretion of Calcium and Phosphorus in the Pig

Abstract

In the preceding paper (Moore & Tyler, 1955) two main drawbacks were pointed out to the use of the Bergeim technique for investigating the intestinal absorption and excretion of calcium and phosphorus. Firstly, that it is impossible to determine by analysis of the gastro-intestinal contents the exact section of the tract where absorption of Ca and P is most rapid, mainly because of the lack of a satisfactory reference substance. Secondly, that there is no means of distinguishing between exogenous and endogenous Ca and P in the gastro-intestinal contents. It seemed feasible that these two difficulties might be overcome to a certain extent by the use of radioactive isotopes of Ca and P.