Abstract: Calving records with sex ratio of births were studied in summer, monsoon and winter of local, crossbred and purebred cows. The higher percentage of birth found during summer (39.07%) followed by winter (32.79%) and monsoon (28.14%) and female and male ratio were 48.25:51.75; 44.66:55.34 and 40.83:59.17, respectively in summer, monsoon and winter in local cows; whereas in crossbred cows, birth percentage is highest in summer (36.96%) followed by winter (35.98%) and monsoon (27.06%) and no significant difference were found on sex ratio of births of crossbred cows. The highest percentage of birth of purebred at Holstein-Friesian and Sahiwal cows are noted in winter (40.93%) followed by monsoon (30.48%) and summer (28.59%) and no significant difference were found on sex ratio of births of purebred cows in different seasons.