468.

O'Dell BL, Yohe JM, Savage JE. Zinc availability in the chick as affected by phytate, calcium and ethylenediaminetetraacetate. Poultry Sci. 1964; 43:415-419. (NA34) [Groups of day-old cocks were given for 4 weeks a synthetic diet based on glucose, casein and gelatin with C 1.2, P 0.8% and from 12 to 71 p.p.m. Zn. Supplements to that diet, given singly or together, were 1.2% Ca, 0.5 or 1.0% phytic acid or 55 p.p.m. Zn. Either amount of phytic acid significantly depressed bodyweight if no Zn was added. Supplements of Ca, with or without Zn, had no effect on weight. With 0.5% phytic acid and 55 p.p.m. Zn, Ca significantly reduced growth. Analysis of variance showed no significant interaction between Ca and phytic acid, a small interaction between Ca and Zn and highly significant interactions between Zn and phytic acid and among all 3.
In other experiments 0.1% ethylenediamine tetraacetate almost completely prevented the growth-depressing effect of 0.5% phytic acid when the diet had 18 p.p.m. Zn. When 1.6% calcium phytate replaced phytic acid there was a small but significant depression of growth; 0.8% had no such effect.]

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