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THE primary interest in plant-origin phytic acid or phytate in animal nutrition has been directed toward the availability of the phosphorus it contains. Although it has long been known that phytic acid chelates calcium, little or no research effort has been expended to determine the quantitative effect of this compound on the level of dietary calcium needed to supply the chick's requirement for this mineral element. Bruce and Callow (1934) suggested that phytic acid could cause a calcium deficiency in a low-calcium diet. Common (1940) emphasized the significance of phytic acid in the calcium metabolism of the fowl. Both natural phytate in foods and sodium phytate reduced calcium absorption in dogs (Hoff-Jorgensen, 1946) and in humans (Bronner et al., 1954; McCance and Widdowson, 1942a, b; Krebs and Mellanby, 1943; Hoff-Jorgensen et al., 1946a, b). The amount of calcium needed to satisfy the physiological requirement of chicks should, therefore, vary with . . .
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Nelson et al. (1968) studied this question.
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