Studies on the Intestinal Absorption and Excretion of Calcium and Phosphorus in the Pig
British Journal of Nutrition
Owing to the importance of calcium and phosphorus in nutrition it is not surprising that problems relating to the intestinal absorption and excretion of these elements have received considerable attention during the last 30 years or so. Nevertheless, there are a number of points on which information is limited and conclusions drawn from results reported in the literature are somewhat conflicting. For instance, it is generally accepted that the absorption of Ca and P takes place in the small
... ce in the small intestine, but Fournier (195 I u) and Fournier & Dupuis (1953 a, b) are of the opinion that the absorption of Ca and P from the stomach is of considerable importance. Also, the weight of experimental evidence obtained over the past years indicates that excess Ca is not excreted through the wall of the large intestine although a number of workers, using essentially the same technique, for example Bergeim (1926 ), Marek, Wellmann & Urbanyi (1935) and Fournier (1950a,b, 1951 have obtained results which they consider to be evidence of such an excretion. The present study was undertaken in an attempt to clarify some of the problems relating to intestinal absorption and excretion of Ca and P. The object of the experiment reported here was to investigate the suitability of the Bergeim (1926) technique for studying the intestinal absorption and excretion of Ca and P in the pig. The pigs and their diet EXPERIMENTAL The experimental pigs, castrated male Saddlebacks, were placed in metabolism cages when 9-10 weeks old. Previously they had been reared out of doors on the University farm. The floors of the metabolism cages were constructed to enable urine to drain away quickly. The pigs were fed twice a day, at 9.30 a.m. and 3.30 p.m. The composition of the basal ration in parts by weight was as follows: ground dredge corn 20, palm-kernel cake 20, middlings 15, bran 15, dried-grass meal 10, flaked maize 7.5, maize meal 7.5, yeast meal 5. Each pig received 625 g of this basal ration per meal, to which were added 20.0 g calcium carbonate and 0'5 g sodium chloride. The basal ration and mineral supplement were mixed thoroughly to a suitable consistency with 2000 ml. water before feeding. As soon as each meal had been consumed adequate drinking water was placed in the feeding troughs. https://www.cambridge.org/core/terms. https://doi.