Effects of Dietary Calcium and Phosphorus Levels upon the Physiological Behavior of Calcium and Phosphorus in the Rat ,

Calcium Retention From Milk-Based Infant Formulas, Whey-Hydrolysate Formula, and Human Milk in Weanling Rhesus Monkeys

“…Other studies, however, have not found an influence of phosphate on calcium absorption. 22,23 Lactose is another factor known to have an enhancing effect on calcium absorp¬ tion, possibly by increasing paracellular diffusion rates (nonsaturable transport) because of its high osmolarity.24,25 Ac¬ cording to manufacturers' information and our own analysis, there is virtually no difference in lactose content of hu¬ man milk samples and whey-and caseinpredominant formula (Table). The low¬ er lactose content in the whey-hydro¬ lysate formula and the soy product is compensated for by addition of maltodextrin and corn syrup, respectively, which also increase the osmolarities of these products after being digested.…”

A Study of the Effects of Gonadal Hormones on the Phosphorus Balance of the Domestic Fowl

“…It has been adequately shown that by means of radiochemical procedures utilising the principle of isotopic dilution, the amount of faecal endogenous excretion of an element can be measured (Hansard et al, 1951(Hansard et al, , 1954Kleiber et al, 1951;Lofgreen and Kleiber, 1953;Visek et al, 1953). These procedures involve the use of a conventional balance experiment, together with a study of the distribution of * Recipient of a British Egg Marketing Board Studentship.…”

Effect of previous dietary history of calcium intake on the skeleton and calcium absorption in the rat

“…B. KEIMM ADAPTATION AND DIETARY CALCIUM64 from the body so that it could be distinguished from the unabsorbed dietary calcium. The technique used was that of Hansard & Plumlee (1954), modified by Whittemore (1970). Five days before the start of the balance study each rat was injected in the left thigh muscles with 25 mc 45Ca (specific activity lmc/30-50 /sg Ca).…”

“…Values for fecal endogenous calcium gleaned from the literature include 19-5, 14, and 15-5 mg/5 days with apparent absorptions of calcium of 65, 54 and 63 % respectively (Hansard & Plumlee, 1954;Shah & Draper, 1966; Cohn, Teree & Gusmano, 1968). These figures may be compared with those given in the present paper, since they are all from rats consuming about 100 mg calcium/5 days.…”