Figure 1: Experimental design of the used depletion – repletion study.
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the basal diet, due to limited availability of native zinc in the feed raw materials. Compared to the inorganic sources of Zn-SUL and TBZC, the apparent digestibility of zinc was significantly higher in animals supplemented with Zn-AAC or Zn-GLY, indicating a higher zinc absorption rate. The zinc digestibility of the Zn-MHA supplemented group, was significantly higher than in in the Zn-SUL group. Differences were not significant between chelated forms. The estimated relative bioavailability value (RBV) of zinc additives was 136%, 135%, 124%, and 110% for Zn-GLY, Zn-ACC, Zn MHA, and TBZC, respectively, compared to Zn-SUL (100%),
Figure 2: Apparent digestibility of zinc in piglets supplemented with different zinc sources (%, Means, SD, n = 12, abcd differences between treatments, P<0.05)
significant TOXINBINDERS IMMUNOGLOBULINS
PROBIOTICS PREBIOTICS
BETAINE
CHELATED MINERALS
THE BUILDING BLOCKS OF HIGH PERFORMANCE
Implications A number of studies have demonstrated that animals can perform better when a zinc source of higher bioavailability is used with partial replacement of 20 to 50% of zinc sulfate or oxide. This is especially important in young fast-growing animals with high mineral requirements, but low feed intake capacity. Furthermore, in adult animals the zinc status is known to have an effect on the incidence of and susceptibility to diseases, regeneration processes, reproductive performance, leg formation and the health of claws or foot pads. The present study confirmed that in situations of increased demand and presence of dietary antagonists (copper), zinc is bioavailable to a higher extent from the three forms of chelates than native zinc or inorganic sources like Zn- SUL or TBZC. According to this study, no significant differences in zinc digestibility and hence zinc supply status, are to be expected between the tested chelate forms. Thus, differences in product characteristics such as metal content or particle size distribution should be of higher relevance in the choice of chelated form.
Note: References are available on request from the author. FEED COMPOUNDER NOVEMBER/DECEMBER 2018 PAGE 31
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