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Journal of Nutrition Vol. 82 No. 2 February 1964, pp. 249-256
Copyright © 1964 by American Society for Nutrition
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Influence of Various Chelating Agents on the Availability of Zinc1

Pran Vohra and F. H. Kratzer

Department of Poultry Husbandry, University of California, Davis, California

Chelates with stability constants for zinc ranging from 5.3 to 18.8 were tested for growth-promoting activity with turkey poults in a zinc-deficient diet containing isolated soybean protein. The chelates were fed at a level of 0.684 mmole/kg diet for about 20 days. EDDADP, HEDTA and EDTA were most active in improving growth under these conditions. NTA and EDDA were moderately effective in promoting growth while DHEG, IDA, HIEDA, EDDHA, EBONTA, TETA, DTPA and CDTA had only slight or no effect on the growth of poults. A stability constant for zinc between 13 and 17 was most satisfactory.

1 Supported in part by grant number A-5334 from the National Institutes of Health, U.S. Public Health Service.

Manuscript received 23 September 1963.




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