Mineral Metabolism. An Advanced Treatise. Vol. I, Part A. Principles, Processes, and Systems. Edited by C. L. Comar and Felix Bronner. New York, Academic Press Inc., 1960. $12.00

Irving, JA

doi:10.2106/00004623-196143030-00019

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“…This may contrast with the immature ruminant or young milkfed calf, in which the small intestine plays a greater part in the total intestinal secretion (Lofgreen, Kleiber & Smith, 1952;Chandler & Cragle, 1962). Table 4 shows that the estimated total rates of excretion derived by the two methods are closely similar, particularly since the range of P concentration in the salivary secretion may be large (Kay, 1960;Tribe & Peel, 1963).…”

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confidence: 99%

“…Moreover, the question of whether there is a controlled secretion of these elements into the intestinal tract, regulating their concentration in the body, has been disputed for years. The current general consensus, as indicated in recent reviews (Hill, 1963 ;Irving, 1964), is that the excretions of Ca and P are not controlled, but instead represent a loss of these elements in the digestive juices and turnover of the intestinal mucosa. …”

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confidence: 99%

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The effects of phosphorus depletion, and of calcium and phosphorus intake, on the endogenous excretion of these elements by sheep

1966

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I . Injections of and 45Ca were used to study the influence of phosphorus depletion and repletion on the rates of endogenous calcium and P excretion in fifteen P-depleted and eighteen control sheep. 2. When given adequate P, there was a marked increase in the rate of excretion of metabolic faecal P in sheep which previously had been depleted. In control sheep a decrease was found in metabolic faecal P excretion with a diet deficient in P. 3. From the values for metabolic faecal P an indirect estimate of total intestinal secretion was made. The estimate was found to be in approximate agreement with values derived from published values for total daily digestive secretions in sheep. 4. The estimated rates of secretion of intestinal P suggest that after the addition of P to the diet the changes in the rate of excretion of metabolic faecal P in P-depleted sheep were the result of a decreased reabsorption of intestinally secreted P rather than of a change in the rate of secretion into the intestine. After a diet low in this element the decrease in metabolic faecal P excretion by control sheep appeared to be the result of a decreased rate of intestinal P secretion. 5 . The possible significance of changes in metabolic faecal P excretion in relation to body P homoeostasis in the ruminant animal is discussed.The physiological significance of endogenous faecal calcium and phosphorus excretion is not clear. Moreover, the question of whether there is a controlled secretion of these elements into the intestinal tract, regulating their concentration in the body, has been disputed for years. The current general consensus, as indicated in recent reviews (Hill, 1963 ;Irving, 1964), is that the excretions of Ca and P are not controlled, but instead represent a loss of these elements in the digestive juices and turnover of the intestinal mucosa.

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