The research aimed to determine the estrous cycle in Buffaloes using a digital heat and ovulation detector. To do this, 30 buffalo females were studied for 40 days with an average age of 4 years and average weight of 489 kg, to which the daily measurement of vaginal mucus resistance was performed using a Draminsky (ED) heat and ovulation detection equipment. In addition, swelling of the vulva, presence of vaginal mucus and depigmentation of the heat detector patch were determined. Subsequently, measures of central tendency (range, mean, median, maximum, minimum, variance) were used, as well as graphs and histograms of frequencies through the Microsoft Excel version 365 program for the tabulation of the information.