The present investigation was undertaken to study certain factors affecting the productive and reproductive performances of crossbred dairy cows maintained at fifteen dairy farms in Chittagong metropolitan area, Bangladesh over from the years 1992 to 2005. The data consisted of phenotypic values of five dairy traits such as age at first calving(AFC), post partum heat period (PPHP), calving interval (CI), lactation length (LL) and lactation milk yield (LMY) of 480 different crossbreds of Friesian cows were studied. The analyses of variance indicated that the effect of the farm was significant (P≤ 0.05) for all traits, whereas none of the traits influence by the season of birth. The calving years were significant (P≤ 0.05) for CI, LL and LMY. Least-squares means illustrated that the effect of lactation number on PPHP, LL and LMY was significant (P≤ 0.05). ). It can be concluded that satisfactory management and appropriate genetic improvement strategies would result in improving performance of crossbred dairy cows. 1297506172.php