An incidence of 40.7% of buffaloes showed a short estrous cycle within 9.9 weeks during the post-partum period. These cycles were detected when milk progesterone levels increased over 2.5 nml/l. The duration of short cycles were two weeks with short luteal phase less than 10 days. The duration of normal cycles were 3.2 + 1.5 weeks. Non significant differences were recorded between milk progesterone levels during the first week of the cycle for both short and normal length cycle. Moreover, a significant increase (P> 0.001) in milk progesterone were recorded during the third week of normal length cycle. The group of buffaloes diagnosed as non return was proved latter as pregnant by rectal palpation.