In verent years, with rapid increasing of dariy cownumber in our country, the dignosis and treatment of theirdiseases is very significant.In veterinary clinical work, ECGis an effective few dsta about ECG of dairy cows, it is difficult to heart disease. To select ECG determination method and its mormal valwe and provide evidence forlastion diagnosis of dairy cow bort disease, we determined ECG of 46 Holstein cows.
