A total of 133 ovulatory cycles were studied on fifteen primiparous Egyptian
buffaloes during the period from July 2001 to April 2003.The animals had 3.75 years
of age with an average weight 423.47± 5.36 kg. All buffaloes were left without
services for one year (12 months) to study the ovulation pattern and regular ovulatory
cycle. The average lengths of the ovulatory cycle, postpartum interval to first ovulation
and postpartum interval to first ovulatory estrus was 23.41±3.647, 128.87±80.761
and 187.85±83.100 days, respectively. During the study 146 ovulations were
recorded, the average number of ovulations and quiet ovulations per buffalo cow
were 9.73 and 5.07, respectively. The highest percentage of quiet ovulation and
ovulatory estrus were recorded during October .On conclusion, the distribution of
ovulation on monthly basis revealed that the Egyptian buffalo cows could ovulate
around the year, however, cows show some fluctuation in monthly percentages
with a peak value during October and drop during April and May.