Rogers G, Porter R, Jolley L C, Leaver D D
Aust Vet J. 1977 Nov;53(11):523-8. doi: 10.1111/j.1751-0813.1977.tb07936.x.
The relationship between intensity of production and the occurrence of hypomagnesaemia and grass tetany in dairy cattle was investigated from 1966-1970 at the Ellinbank Dairy Research Station, Warragul, Victoria. Hypomagnesaemia and/or grass tetany occurred in cows grazing at both high (3.2 cows/hectare) and low (2.2 cows/hectare) stocking rates over the four-year period. Pasture Mg concentrations remained relatively high (0.2% dry matter) throughout this period, except in the low stocking rate pastures in one year, 1967. It is concluded that hypomagnesaemia and grass tetany was precipitated by a combination of low dry matter intake in winter and the effects of a gradual increase of K concentration in autumn and winter pastures, following the heavy application of K fertilizer. Under these conditions, MgO supplementation was inadequate to prevent grass tetany occurring in some animals.
1966年至1970年期间，在维多利亚州瓦拉古尔的埃林班克奶牛研究站，对奶牛生产强度与低镁血症和青草搐搦发生率之间的关系进行了调查。在这四年期间，高（3.2头/公顷）、低（2.2头/公顷）不同载畜率放牧的奶牛均出现了低镁血症和/或青草搐搦。在此期间，除了1967年载畜率低的牧场外，牧草镁含量一直相对较高（干物质含量为0.2%）。得出的结论是，冬季干物质摄入量低，以及在大量施用钾肥后，秋冬牧场钾浓度逐渐增加的影响，共同促成了低镁血症和青草搐搦。在这些条件下，补充氧化镁不足以防止某些动物发生青草搐搦。
