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Not AvailableThe present study was undertaken to study the monthly and seasonal variations in calving pattern, calf sex and birth weight of calf during the year 2016-17 at Nili Ravi farm of CIRB, Sub Campus, Nabha (Punjab). The results showed that the 154 calvings occurred during the year 2016-17, out of which 82 males and 70 females were born. The maximum number of calvings occurred in the month of September (31), followed by August (23), January (19), November (14), April (13), October (12), December (12), February (10), July (6), March (5), May (5) and June (4). The overall average birth weight of male calves was 36.63 Kg and those of female calves was 36.46, with an overall average birth weight of male and females calves of 36.59 Kg. In the present study, the overall average birth weight of male calves was slightly higher than those of female calves despite the very low birth weight of two male calves in the month of September (11.4Kg) and November (16.0 Kg). The average birth weight of male calves was the highest in the season of winter (38.6 Kg), followed by spring (37.47), autumn (35.83) and summer (34.61). The average birth weight of female calves was the highest in the season of spring (38.55 Kg), followed by winter (37.33), summer (35.72) and autumn (34.3 Kg). The overall average birth weight of male and female calves was the highest in the season of spring (37.92 Kg), followed by winter (37.81), summer (35.33) and autumn (35.29 Kg). With regard to seasonal variations in calving pattern of Nili Ravi buffaloes, the highest number of calvings (66; 42.85%) occurred in the season of autumn (in the months of August, September and October); followed by winter (45; 29.22%) in the months of November, December and January; spring (28; 18.88%) in the months of February, March and April; and summer (15; 9.74%) in the months of May, June and July. It was concluded that the highest number of calvings occurred in autumn followed by winter, spring and summer. The average birth weight of calves was highest in the month of February and lowest in the month of June. The study further concluded that overall average birth weight of male calves was slightly higher than those of female calves.Indian Council of Agricultural Research (ICAR