Effects of Iron Glycine Chelate on Growth, Tissue Mineral Concentrations, Fecal Mineral Excretion, and Liver Antioxidant Enzyme Activities in Broilers
文摘
The study was conducted to determine the effects of iron glycine chelate (Fe-Gly) on growth, tissue mineral concentrations, fecal mineral excretion, and liver antioxidant enzyme activities in broilers. A total of 360 1-day-old commercial broilers (Ross?×?Ross) were randomly allotted to six dietary treatments with six replications of ten chicks per replicate. Broilers were fed a control diet with no Fe supplementation, while five other treatments consisted of 40, 80, 120, and 160?mg Fe/kg diets from Fe-Gly, and 160?mg Fe/kg from ferrous sulfate, respectively. After a 42-day feeding trial, the results showed that 120 and 160?mg Fe/kg as Fe-Gly improved the average daily gain (P-lt;-.05) and average daily feed intake (P-lt;-.05) of broilers (4-?weeks). Addition with 120 and 160?mg Fe/kg from Fe-Gly and 160?mg Fe/kg from FeSO4 increased Fe concentration in serum (P-lt;-.05), liver (P-lt;-.05), breast muscle (P-lt;-.05), tibia (P-lt;-.05), and feces (P-lt;-.01) at 21 and 42?days. There were linear responses to the addition of Fe-Gly from 0 to 160?mg/kg Fe on Fe concentration in serum (21?days, P--.005; 42?days, P--.001), liver (P--.001), breast muscle (P--.001), tibia (P--.001), and feces (21?days, P--.011; 42?days, P--.032). Liver Cu/Zn superoxide dismutase activities of chicks were increased by the addition of 80, 120, and 160?mg Fe/kg as Fe-Gly to diets at 42?days. There were no differences in liver catalase activities of chicks among the treatments (P-gt;-.05). This study indicates that addition with Fe-Gly could improve growth performance and iron tissue storage and improves the antioxidant status of broiler chickens.