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Effects of Feeding High Manganese Rice Straw on the Mineral Status of Beef Cattle

机译：饲喂高锰稻草对牛肉牛矿物质状态的影响

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The objective of this study was to determine the effects of feeding rice straw containing high concentrations of manganese (Mn) to beef cattle on liver Mn concentration and its potential to interfere with other minerals. Open, crossbred cows (N = 12)in good health were randomly assigned to one of three treatment group diets: oat hay (control), rice straw containing 550 ppm Mn and rice straw containing 770 ppm Mn. High quality alfalfa hay was supplemented at the same amount to each group to ensure adequate energy and protein intake. Blood, serum and liver samples were taken from each animal at day 0, 49 and 93 and analyzed for trace mineral and heavy metal content. Liver Mn concentrations for the group receiving 770 ppm Mn rice straw were significantly higher than for the control group at both day 49 and day 93 (P < 0.05). Liver Mn concentrations for the 550 ppm Mn group were significantly higher than for the control group at day 93 (P < 0.05). Liver Mn concentrations among the two rice straw treatments were not significantly different from each other. Serum sodium (Na) levels in cows fed the 770 ppm Mn rice straw were significantly higher than the animals fed 550 ppm rice straw at day 49 (P < 0.05); however, there appeared to be no significant difference at day 93. There was no significant difference among treatment groups for other trace mineral and heavy metal concentrations. While it appeared cattle fed rice straw maintained higher liver Mn concentrations relative to control cattle, these concentrations were within the reference range of 2-6.5 ppm. There were no significant differences among treatment groups for average daily gain. No practical impact on the mineral status of cattle fed high Mn rice straw was observed over the 93-day period.
机译：这项研究的目的是确定向肉牛饲喂含高锰（Mn）的稻草对肝脏Mn的影响及其对其他矿物质的干扰。将健康状况良好的杂种母牛（N = 12）随机分配到三个治疗组日粮之一：燕麦干草（对照），含550 ppm Mn的稻草和含770 ppm Mn的稻草。每组均以相同量补充优质苜蓿干草，以确保充足的能量和蛋白质摄入。在第0、49和93天从每只动物采集血液，血清和肝样品，并分析其痕量矿物质和重金属含量。在第49天和第93天，接受770 ppm锰稻草的组中的肝脏Mn浓度均显着高于对照组（P <0.05）。在第93天，550 ppm Mn组的肝脏Mn浓度显着高于对照组（P <0.05）。两种稻草处理之间的肝脏锰浓度没有显着差异。饲喂770 ppm锰稻草的母牛的血清钠（Na）水平在第49天显着高于饲喂550 ppm稻草的动物（P <0.05）;然而，在第93天似乎没有显着差异。其他微量矿物质和重金属的浓度在治疗组之间也没有显着差异。尽管看起来喂稻稻草的牛相对于对照牛具有较高的肝脏Mn浓度，但这些浓度在2-6.5 ppm的参考范围内。治疗组之间的平均日增重没有显着差异。在93天内未观察到对饲喂高锰稻草的牛的矿物质状况的实际影响。

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