PROBLEM TO BE SOLVED: To provide a method for detecting the estrus of cattle by which the starting period of the estrus per cattle can accurately be detected.SOLUTION: The estrus is decided when an activity difference is a threshold value or above by paying attention to the activity time of the cattle; detecting a signal continuation for a prescribed time or more set beforehand from signals of a motion sensor for detecting the movement of the cattle built in a tag mounted on a neck of the cattle; converting the duration of the detected signal into each numerical value of units of the prescribed time; obtaining activity numbers; accumulating the activity numbers for each unit time; computing the activity numbers for the unit time which is the activity time of the cattle; computing each average activity number that is the average value of the activity numbers for the unit time in each time zone till the regulated activity time indicating the range of the time zone in retrospect to the past and each average standard activity number which is the average value of the average activity numbers in the same time zone as the latest activity number for the unit time in each day till the regulated number of days of activity indicating the range of the number of days in retrospect to the past; subtracting the average standard activity number from the average activity number; and computing the activity difference.
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