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- W2096562495 abstract "Two experiments were conducted to investigate the effects of time and dietary Fe on tissue Fe concentrations following short-term, high level supplementation for use as a bioassay procedure for supplemental Fe sources for ruminants. In Experiment 1, 28 wethers were allotted randomly to four experimental diets which were fed for 15 or 30 days. The basal maize–soyabean meal–cottonseed hulls diet (193 mg kg −1 Fe) was supplemented with 0, 400, 800 or1200 mg kg −1 added Fe from reagent grade ferrous sulfate (FeSO 4 ·7H 2 O). Iron concentrations in liver, kidney, and spleen increased ( P <0.05) as dietary Fe increased; however, muscle, heart, and bone Fe concentrations were unaffected. A logarithmic transformation of liver or kidney Fe concentrations at 30 days regressed on added dietary Fe produced the best fits to a linear model. In Experiment 2, bioavailability of Fe from three feed grade ferrous carbonates known to differ (carbonates A, B, and C) was compared to that from reagent grade ferrous sulfate. The dietary treatments fed for 30 days included the above basal diet (90 mg kg −1 Fe) supplemented with 0, 300, 600 or 900 mg kg −1 added Fe from ferrous sulfate or 600 mg kg −1 Fe from ferrous carbonates A, B, or C. Liver Fe concentrations from sheep fed ferrous sulfate were numerically greater than those of animals fed the carbonate sources or control diet. Kidney Fe concentrations from lambs fed ferrous sulfate at 600 mg kg −1 Fe or carbonate-A were greater ( P <0.05) than those fed carbonates B or C. Iron concentrations in spleen were lower ( P <0.05) in lambs fed carbonate-B than for those fed 600 mg kg −1 Fe as ferrous sulfate, but were similar to other carbonates. Overall average bioavailability estimates based on multiple regression slope ratios for the three tissues were ferrous sulfate 1.00, carbonate-A 0.55, carbonate-B 0.00, and carbonate-C 0.20. Estimates for carbonates A and C were similar to those based on hemoglobin concentrations reported previously for young swine supplemented at dietary concentrations near the requirement." @default.
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- W2096562495 date "2001-04-01" @default.
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- W2096562495 title "Effects of time and dietary iron on tissue iron concentration as an estimate of relative bioavailability of supplemental iron sources for ruminants" @default.
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- W2096562495 doi "https://doi.org/10.1016/s0377-8401(01)00208-5" @default.
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