The breeding records of 238 primiparous Friesian cows bred. at Abnoob El-Hammam dairy farm (Assiut) were studied. The obtained results showed that the average postpartum breeding interval was 111.17+50.99 days. The longest period (113.05 days) was observed during Winter and the shortest was observed during Summer. There was a statistically significant (P/ 0.05) difference between the different seasons studied. Conception rate to service during the first postpartum heat was highest (55.36%) during Winter and Lowest during summer (44.0%). The average postpartum breeding interval was shortest (97.22 days) in animals which gave their first calf at an age less than 24 month. Male calves were heavier (29.63 kg) than female calves (28.97 kg).