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Effect of Zinc Source and Dietary Level on Zinc Metabolism in Holstein Calves^*

C. L. Wright and J. W. Spears

Department of Animal Science and Interdepartmental Nutrition Program, North Carolina State University, Raleigh 27695-7621

Corresponding author: J. W. Spears; e-mail: Jerry_Spears{at}ncsu.edu.

Forty-eight Holstein male calves were stratified by origin and body weight and randomly assigned to one of 4 treatment groups. Dietary treatments were administered in 2 phases. In phase 1, treatment groups received the basal diet with no supplemental Zn (control), basal diet plus 20 mg of Zn/kg of DM as ZnSO₄ or Zn proteinate (ZnProt), or basal diet plus 20 mg of Zn/kg of DM with 50% of the Zn supplied from each source (ZnM) for 98 d. In phase 2, calves continued to receive the same Zn source fed in phase 1; however, half of the calves in each treatment group were randomly selected to receive 500 mg of Zn/kg of DM (HiZnSO₄, HiZnProt, HiZnM) for 14 d. Gain, feed intake, and feed efficiency of calves were not affected by treatment in either phase of the experiment. Treatment had no affect on plasma Zn concentration or alkaline phosphatase activity in phase 1, but liver Zn concentration was greater in calves fed ZnSO₄ than those fed ZnProt. In phase 2, plasma Zn was greater in calves fed HiZnProt and HiZnM than in those fed HiZnSO₄. Liver Zn was greater in calves fed HiZnProt than in those fed HiZnSO₄. Duodenal Zn concentrations were greater in calves supplemented with HiZnProt and HiZnM than those supplemented with HiZnSO₄. Liver metallothionein was greater in calves that received 500 mg of Zn/kg than in calves that received 20 mg of Zn/kg, but was not affected by Zn source. Calves fed HiZnProt and HiZnM had greater kidney Zn concentrations than those fed HiZnSO₄. Heart, spleen, testicular, and bone Zn concentrations were not affected by Zn source. Hoof wall samples contained nearly 3-fold greater Zn concentrations than hoof sole. Calves fed ZnSO₄ had greater Zn concentration in hoof wall samples than those fed ZnM. Hoof sole Zn concentration was not affected by Zn source or concentration. Plasma and tissue Zn concentrations at harvest were generally similar in calves supplemented with 20 mg of Zn/kg from ZnSO₄ or ZnProt. However, when supplemented at 500 mg of Zn/kg, ZnProt was absorbed to a greater extent than ZnSO₄, based on higher plasma, liver, duodenal, and kidney Zn concentrations.

Key Words: zinc • proteinate • bioavailability • cattle

Abbreviation key: Alp = alkaline phosphatase, HiZnM = high zinc mix, HiZnProt = high zinc proteinate, HiZnSO₄ = high zinc sulfate, MT = metallothionein, ZnM = zinc mix (50% ZnSO₄ 50% ZnProt), ZnProt = zinc proteinate

This article has been cited by other articles:

				C. L. Wright, J. W. Spears, and K. E. Webb Jr Uptake of zinc from zinc sulfate and zinc proteinate by ovine ruminal and omasal epithelia J Anim Sci, June 1, 2008; 86(6): 1357 - 1363. [Abstract] [Full Text] [PDF]