One of the major contributors to poor fertility and fail to attain a one-year calving calendar of a dairy herd is inability to know all behavioral oestrus sign and ineffective detection of estrus. As behavioral oestrus sign and physical change is different between breed and even individual variability is there, knowledge of primary and secondary oestrus sign is crucial. Recently, it has become evident that cow factors contribute largely to low detection rates. Until now, standing behavior, a primary oestrus sign has been the only considered symptom and used to determine the right moment for insemination. However, standing behavior is not observed in more than 50% of the cows in estrus. Therefore, the aim of the study was to map out the different behavioural and physical signs of estrus manifested in Boran and Holstein Frisian dairy cow after hormonally oestrus induced. A total of 40 (20 Boran and 20 Holstein Frisian breed) 31 multiparous and 9 primiparous which are apparently healthy cattle were used to study behavioral and physical signs of estrus, diurnal variations in the occurrence of estrus and the effect of estrus intensity on conception rate (CR). Seven (78%) of nine primiparous cows showed standing oestrus in addition to secondary oestrus sign. The other two primiparous cows showed secondary oestrous signs only. Twenty-seven (87%) of thirty-one multiparous cows showed standing oestrous in addition to secondary oestrus sign and the other four cows showed secondary oestrous signs only. Standing to be mounted, the primary oestrus sign was more pronounced in Holistein friesian 90% (18/20) compared to Boran breed 65% (13/20). Parity wise, standing to be mounted was equally manifested in primiparous and multiparous animals regardless of breed. Regardless of parity, standing to be mounted (65, 90%) Vaginal mucus discharge (55,90%), Bellowing (20,25%), head and side mounting (15,25%), grouping and circling (40,70%), sniffing and liking (60,95%), chain resting.......