The heartbeats of farm animals have been mainly measured by electrocardiography (ECG) for several purposes, such as the estimation of energy expenditure and the evaluation of autonomic nervous system balance in heart rate variability analysis. However, the measurement of ECG requires to maintain conductivity at which electrodes are fixed. In addition, the measurement of ECG is prone to noise signals due to animal movement. Alternatively, in human studies, microvibration on the body surface called ballistocardiography (BCG) has recently been studied as a proxy for heartbeat method. The objective of the present study was to develop a BCG measurement as a new method for measuring heartbeat of cattle. By using high sensitivity piezo film contact microphone sensors, we conducted two experiments. The experiment to search appropriate positions for BCG measurement indicated that the most appropriate position was around center of the right side just below the wither of test animals. The experiment for developing a noise cancellation method suggested that an effective method for removing noise signals may be to place microphone sub-sensors in addition to a main sensor at the appropriate position and derive the difference in signal magnitudes between the sensors.