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Chelated Trace Minerals for G-F Swine¹

University of Nebraska, Lincoln 68503³

Abstract

NINETY-SIX cross-bred (D x H x Y) barrows were used in a completely randomized block experiment with six treatments. Pigs were fed a corn-soy basal diet, low in zinc (31.6 ppm). Treatment combinations were: (A) Basal with no added trace minerals (TM), (B) Basal+TM from reagent grade sources (RTM) and (C), (D), (E) and (F) received the basal diet+chelated TM (CTM) at 100%, 75%, 50% and 25% the level of the RTM of treatment B, respectively. No significant differences due to treatment were observed for average daily gain, feed intake or gain/feed ratio. RTM maintained higher serum Cu levels than CTM. Serum zinc increased with 100% CTM and decreased drastically when 50% and 25% CTM diets were fed. Hair Cu concentrations decreased with all treatments. An increase in hair Zn concentration was obtained with the 100% and 75% CTM diets. The highest bone Cu concentration was produced with 100% CTM, whereas the highest bone Zn values were obtained with RTM followed by the 100% CTM-fed groups. The greatest bone breaking strength value was obtained with pigs fed 100% CTM followed closely by those fed the unsupplemented basal diet. Bone breaking strength decreased markedly with RTM and with the 75, 50 and 25% CTM treatments. Metatarsal bone length and diameter were not significantly affected by dietary treatments.

¹ Published with the approval of the Director as Paper No. 3498, Journal Series, Nebr. Agr. Exp. Sta. Research reported was conducted under Project 13-22.

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

³ Department of Animal Science. Acknowledgement is made to John Welch, Robert Harms and Robert Hageman and Associates for assistance with the conduct of the research and the development of certain laboratory procedures, and to Dawes Laboratories, Inc., Chicago, for providing the vitamins used in the experimental diets.