Zetterholm R
Acta Vet Scand. 1978;19(1):30-8. doi: 10.1186/BF03547639.
The bone mineral content in two coccygeal vertebrae of 16 cows of Swedish Red and White Breed was measured with dichromatic photon absorptiometry during the period nine weeks prepartum to one week postpartum. For eight weeks before calving eight cows received 37 g Ca and 50 g P/day and the other eight, 76 g Ca and 50 g P/day. The mean bone mineral changes of the cows on the low Ca ration did not change. The cows on the high Ca ration had a slight increase (4 %) in bone mineral content to some days before calving. The postpartum bone mineral changes were, however, lower than the one prepartum. There was no significant difference between the mean bone mineral changes of the two groups.
在产前9周到产后1周期间，采用双色光子吸收法测量了16头瑞典红白奶牛两个尾椎骨的骨矿物质含量。在产犊前8周，8头奶牛每天摄入37克钙和50克磷，另外8头奶牛每天摄入76克钙和50克磷。低钙日粮组奶牛的平均骨矿物质变化没有改变。高钙日粮组奶牛在产犊前几天骨矿物质含量略有增加（4%）。然而，产后骨矿物质变化低于产前。两组的平均骨矿物质变化之间没有显著差异。
