Abstract
The availability of zinc from its compounds with various inorganic phosphates, phytic acid and some organic chelates was studied for turkey poults fed purified diets containing isolated soybean protein. With 15 ppm zinc in the diet, the gain in weight of turkey poults was less with CaHPO4·2H2O, sodium phytate or calcium phytate than with sodium hexametaphosphate, sodium tripolyphosphate, sodium acid pyrophosphate or sodium orthophosphate supplying one-half of the dietary phosphorus (0.6%). When mixed with enough zinc oxide to provide 15 ppm zinc before mixing with the purified diets at levels of 0.684 mmole, sodium tripolyphosphate, sodium hexametaphosphate and sodium phytate reduced its availability. Various phosphates did not improve the availability of zinc already present in the diets. Even though 1,2-diaminocyclohexanetetraacetic acid and diethylenetriaminepentaacetic acid were far less effective than ethylenediaminetetraacetic acid in making dietary-bound zinc available for turkey poults, zinc was equally available from its complexes with these compounds and citric acid but not as available from complexes with orthophosphoric acid, hexametaphosphoric acid, pyrophosphoric acid, tripolyphosphoric acid or phytic acid.
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