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Zinc-Amino Acid Complexes for Swine^1,2,3,

University of Nebraska^,6, Lincoln 68583-0908

⁴ To whom reprint requests should be addressed.

Abstract

Two experiments were conducted to determine the effect of sources of dietary zinc on gain, feed conversion and blood and bone traits of swine. In the first experiment 96 pigs were used in a 28-d study. The pigs were fed diets with no supplemental Zn or with either 9 or 12 ppm supplemental Zn from zinc sulfate (ZnSO₄), zinc methionine (ZnMet) or zinc methionine with picolinic acid (ZnMet w/PA), each with or without 5% added corn oil. There were differences (P<.05) in average daily gain (ADG) and average daily feed intake (ADFI) between the pigs fed the two organic Zn sources, with those fed ZnMet w/PA showing the better gains and feed conversion. However, neither organic Zn source resulted in pig performance that was different from either the diet with no supplemental Zn or the diets supplemented with Zn from ZnSO₄. In the second experiment the same dietary Zn sources and treatments were fed as in Exp. 1 except that corn oil was deleted as a variable. No differences in ADG, ADFI, feed/gain (F/G) or in changes in serum Zn or Cu were observed among treatments during either the 21-d nursery or the 56-d growing periods. During the subsequent 56-d finishing period ADG and ADFI were greater (P<.01) for pigs fed the Zn-supplemented diets than for those fed the diets without supplemental Zn. There were no differences among treatments in F/G during the finishing period. Zn content of bone ash was lower (P<.01) in the non-Zn-suppIemented pigs. These data suggest that the Zn sources used are of similar biological value and do not support the theory that picolinic acid aids Zn absorption.

¹ Published as Paper No. 7887, Journal Series, Nebraska Agr. Exp. Sta. Res.

² The technical assistance of Mary Barnes, Joy Kovar and Roy Carlson is gratefully acknowledged and appreciation is expressed to Diana J. Smith for manuscript preparation.

³ The Zn-methionine and Zn-methionine with picolinic acid were furnished by ZINPRO Corp., Chaska, MN 55318.

⁵ Current address: Dept. of Anim. Sci., North Dakota State Univ., Fargo, ND 58105.

⁶ Dept. of Anim. Sci.

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