The lengths of the normal oestrus cycle were 20.53+0.98 and 19.53+0.5 days in Egyptian Baladi and Anglo Nubian does, respectively. Egyptian Baladi goats showed shorter oestrus ( 17 days) were noticed to be more than the Anglo Nubian. Most of these short cycles occurred at the beginning of winter (December), spring (March) and summer (June). The overall mean of oestrus period length was 50.43+1.65 hours in Egypt ian Baladi goats and 41.5+2.17 hours in Anglo Nubian does. There were significant differences between Baladi and Anglo Nubian goats according to effect of season on heat duration.