Wiggers K D, Nelson D K, Jacobson N L
J Dairy Sci. 1975 Mar;58(3):430-1. doi: 10.3168/jds.S0022-0302(75)84584-X.
Twenty of 60 control cows fed a "normal" diet prepartum developed parturient paresis whereas none of 37 fed a low-calcium (13 to 18 g/cow per day) diet prepartum developed the disease.
60头产前饲喂“正常”日粮的对照奶牛中有20头发生产后瘫痪,而37头产前饲喂低钙(每天每头13至18克)日粮的奶牛中没有一头发生产后瘫痪。