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S. J. Hartman, O. N. Genther-Schroeder, S. L. Hansen, 355 Comparison of trace mineral repletion strategies to overcome a high antagonist diet, Journal of Animal Science, Volume 95, Issue suppl_2, March 2017, Page 173, https://doi.org/10.2527/asasmw.2017.355
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Abstract
The objective was to compare trace mineral (TM) repletion strategies after depletion by S and Mo. Seventy-two Red Angus steers were blocked by BW (254 ± 14 kg) and assigned equally (6 steers per pen, fed via GrowSafe bunks) to corn silage–based depletion period diets either supplemented with Cu, Mn, Se, and Zn at NRC recommendations (CON) or supplemented with 0.3% S (CaSO4), 5 mg of Mo/kg DM, and no added TM (DEP). Ending depletion liver Cu, Mn, and Se concentrations were lesser (P < 0.0001) for DEP vs. CON, whereas Zn was not different (P = 0.28). On d 89, steers were equally divided within diet to 1 of 3 TM repletion strategies: 1) Multimin90 injection (contained Cu, Mn, Se, and Zn) and 100% of NRC dietary TM supplementation from inorganic sources (ITM), 2) saline injection and 150% of NRC from inorganic sources (ING), or 3) saline injection and 150% of NRC recommendations provided as 25% organic and 75% inorganic sources (BLEND). Depletion steers received supplemental S and Mo throughout repletion. Liver TM was determined on d −9, 14, 28, and 42 of the repletion period and analyzed as repeated measures using PROC GLIMMIX (n = 12 per treatment). The interaction of depletion × repletion strategy × day was not significant for any variable (P ≥ 0.19). Liver Se (P < 0.0001) and Zn (P = 0.09) concentrations were lesser in DEP vs. CON throughout repletion. Depletion diet by day (P < 0.0001) affected liver Cu, where CON did not differ across repletion (averaging 262 mg/kg DM) whereas DEP increased across all days, ending at 71 mg/kg DM. Repletion Cu and Se were affected by repletion strategy × day interactions (P < 0.0001), where d 0 and 42 values were similar across TM sources, d 14 ITM values were greater than other treatments, and d 28 ITM values were greater than ING, whereas BLEND tended to be (Cu) or was greater than (Se) than ING. At the start of repletion, liver Mn concentrations were lesser in steers assigned to ITM than ING and BLEND (P ≤ 0.004); however, on d 14, ITM and ING steers had greater liver Mn than BLEND steers (P ≤ 0.04), with no differences on d 28 and 42. These data suggest that regardless of dietary antagonists, ITM rapidly repleted Cu and Se, whereas similar repletion took 28 and 42 d for the BLEND and ING treatments, respectively.
