* HORIBA Advanced Techno, Co., Ltd.
Hypocalcemia due to decreases of calcium ions (iCa) in blood of dairy cows is a common disease that affecting many perinatal dairy cows. The iCa measurement and quick treatment are strongly required in order to keep dairy cow healthy and maintain milk production. However, the iCa concentration cannot be measured quickly on site because accurate measurement of iCa requires strict anaerobic environment and temperature control. In this paper, we introduce that the iCa concentration in blood can be measured quickly on site by the use of the LAQUAtwin calcium ion meter.