School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.
School of Mathematics and Statistics, The University of Sydney, Sydney, NSW 2006, Australia.
Meat Sci. 2021 Oct;180:108560. doi: 10.1016/j.meatsci.2021.108560. Epub 2021 May 17.
This study assessed the capacity of magnesium supplementation to reduce muscle glycogen loss, ultimate pH and increase plasma magnesium in pasture fed slaughter cattle. Beef cattle (n = 1075) from 14 farms were supplemented with or without magnesium pellets for 7-14 days prior to slaughter. Magnesium was allocated at 9.83 g of elemental magnesium per head per day, while the control diet was balanced to be isoenergetic and isonitrogenous, but contained no added magnesium. Groups of cattle (n = 44) were slaughtered at the same processing plant over two consecutive seasons, from August - September 2016 to May - July 2017. Magnesium supplementation increased muscle glycogen (P < 0.01) in cattle supplied from 2 of 14 farms, and increased plasma magnesium in 4 of 14 farms (P < 0.01). Magnesium supplementation had no effect on overall incidence of ultimate pH between the magnesium and control supplementation groups. The benefits of short term magnesium supplementation prior to slaughter was inconsistent for protecting muscle glycogen.
本研究评估了镁补充剂减少放牧牛肌肉糖原损失、最终 pH 值和增加血浆镁的能力。在屠宰前 7-14 天，14 个农场的 1075 头肉牛补充了或没有补充镁丸。镁的分配量为每头每天 9.83 克元素镁，而对照饮食则是能量和氮平衡，但不添加镁。两组牛（n=44）在两个连续的季节，2016 年 8 月至 9 月至 2017 年 5 月至 7 月，在同一加工厂进行屠宰。镁补充增加了来自 14 个农场中的 2 个农场的牛的肌肉糖原（P<0.01），并增加了 14 个农场中的 4 个农场的血浆镁（P<0.01）。镁补充对镁和对照补充组之间的最终 pH 值的总体发生率没有影响。宰前短期镁补充对保护肌肉糖原的益处并不一致。
