Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2000.2169.2170BughioS. ShahaniA.K. MiraniA.H. MorianiA. A. OadF. C. BughioB.A. 122000312The data on various reproductive behaviours of 1000 buffaloes in 15 randomly selected farms of Hyderabad region during July 1997-June 1999 were collected and analysed. The highest percentage (48.73) of calving frequency in summer and the lowest in spring (8.19) was observed. During summer expulsion of fetal membrane took more hours but few hours in autumn, same was true in first postpartum estrus, which took prolonged non significant days in spring and Summer (100 19-102.73 days). Uterus involution period followed the same pattern as in calving frequency i.e., peak in summer and low in spring. The service period of buffalo ranged between 90.39-149.09 days, where it took maximum days in summer and minimum in autumn.]]>Ahmed, N., M. Irfan, R.A. Chaudhry and M. Tahir,198242126Bala, A.C., D.P.S. Sanger and B.K. Son,196720189190Bhat, P.N. and B.N. Patro,197831321325Crete, V. and G. Domanical,19791979El-Eouly, M.A., Y. Afifi and A.K. Kirrella,1977176373Gudi, A.K.,197148210211Kaka, I., J. Dhanani, M.U. Sarno, A.M. Unar and S. Khangharani,19861986Faisalabad, PakistanKhan, M.A.,19941994pp: 150-152pp: 150-152Khan, M.A.,198582324Khattab, R.M., M.B. Aboul-Ela, A.H. Barkawi and A.E. Abdel Aal,19906153160Khosla, S.K., S.S. Gill and P.K. Malhotra,198454407412Misra, M.S., B.P. Sengupta and A. Roy,196316203215Roy, A., B.C. Raisada, A.B.L. Tewari, M.D. Pandey, P.C. Yadav and N.P. Sengupta,19681968pp: 235-246pp: 235-246Roy, D.J. and S.N. Lucktuke,196232152163