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Journal of Nutrition Vol. 108 No. 4 April 1978, pp. 719-730
Copyright © 1978 by American Society for Nutrition
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Effect of NTA and EDTA on Calcium Metabolism of Chickens and Coturnix1

Mamduh Sifri2, Dorothy C. Lowry, F. H. Kratzer and L. C. Norris

Department of Avian Sciences, University of California, Davis, Davis, California 95616

Five experiments were conducted in which various levels of nitrilotriacetic acid (NTA or its salt, Na2NTA) disodium ethylenediaminetetraacetic acid (Na2EDTA) and calcium (Ca) were fed to young chicks, young quail and adult quail. The duration of trials was from 1 to 28 days of age for chicks, 7 to 49 for young quail and 167 to 210 for adult quail. Feeding 0.71% NTA or an equimolar level of Na2NTA caused a moderate decrease in chicks weight and Na2EDTA caused a drastic decrease in body weight of chicks and adult quail. Feeding Na2EDTA caused greater mortality in chicks receiving a low Ca diet than a higher level of Ca. Plasma Ca levels were significantly increased by NTA in young quail and by Na2NTA in adult quail, in contrast, they were significantly decreased by Na2EDTA in adult quail. Dietary NTA promoted greater tibia mineralization (ash/dry matter) in growing chicks. Dietary NTA increased the deposition of zinc (Zn) and manganese (Mn) in the chicks tibia, but, it decreased magnesium (Mg). On the other hand, Na2EDTA caused a significant decrease in Zn and Fe in the chicks tibia and a significant increase in Mn. Coturnix are less sensitive than chickens in responding to dietary chelates.

KEY WORDS: • chickens • coturnix • calcium • bone minerals • NTA • EDTA

1 Supported in part by U.S. Public Health Service, Grant No. 5R01 FD00599-02.

2 M. Sifrl's address is Biochemistry Department, University of Wisconsin, Madison, Wisconsin 53706.

Manuscript received 4 April 1977.




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