The Utilization of Calcium in Carrots, Lettuce and String Beans in Comparison with the Calcium in Milk

Abstract
In a series of ten experiments on growing rats, involving equalization of calcium intakes and of gains in body weight among comparable animals, the calcium retention was determined by carcass analysis following a period of experimental feeding sufficiently long to permit gains in weight of 100 gm. The availability of the calcium of various vegetable foods and of unpasteurized liquid milk was compared in each case with that of the calcium of “dry milk solids” at levels of calcium intake insufficient to promote maximum calcification of the bones. The results obtained justify the following conclusions: