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Effect of EDTA on Utilization of Dietary Zinc by G-F Swine¹

University of Nebraska, Lincoln³ 68503

Abstract

Ninety-Six crossbred (H x Y x D) pigs were randomly allotted to six treatments in a 2 x 3 factorial arrangement. The basal diet fed, to which ethylene diamine tetra acetic acid (EDTA) and zinc additions were made, contained 33.5 ppm Zn. Treatments were 0–0, 0–25, 0–50, 289–0, 289–25 and 289–50 ppm EDTA to added Zn, respectively, with molar ratios of 1:0, 1:0.5 and 1:1.

No significant effects were observed in average daily gain, feed intake or gain/feed ratio due to treatments. Changes (final-initial bleeding) in serum Zn concentration were negative for all treatments; the least decrease was observed for the treatment in which the EDTA-Zn molar ratio was 1:0.5. The 1:1 molar ratio fed group had the lowest serum Zn value. Serum Cu concentration increased with the 1:0.5 molar ratio treatment, but the increase was not statistically significant. A positive serum Zn and Cu relationship was observed. Serum Cu increased with increases in serum Zn which in turn was responsive to dietary Zn levels. No significant difference in hair Cu or Zn was observed due to treatment. However; the 1:0.5 (EDTA-Zn) molar ratio treatment produced a higher hair-Zn value in pigs than the 1:1.

Differences in bone-Cu concentration due to treatments were not significant. Bone Zn tend to decrease with EDTA supplementation and increased significantly with levels of dietary Zn. Liver Zn and Cu concentration were not significantly affected by treatments. No significant difference due to treatments was observed for bone length, diameter, percent ash or breaking strength. The results indicate that pigs fed a practical corn-soy diet will not benefit from the levels of dietary EDTA fed in this experiment. EDTA when fed at a 1:1 molar ratio of EDTA to total Zn produced higher tissue mineral concentrations than when fed at a 1:1.7 molar ratio. Thus, absolute amounts of EDTA are an important factor to consider if added to diets.

¹ Published with the approval of the Director as Paper No. 3500 Journal Series, Nebr. Agr. Exp. Sta. Research reported was conducted under Project 13–22.

² Current address: Institute Colombiana Agropecuario (ICA), Apartado Aereo No. 7984, Bogota, Colombia, S.A.

³ Department of Animal Science. Acknowledgment is made to John Welch, Robert Harms and Robert Hageman and associates for their assistance with the conduct of the experiment and development of certain laboratory procedures and to Dawes Laboratories, Inc., Chicago for providing the vitamin premix used in the experimental diets.