INDUCTION OF ESTRUS IN NORMAL CYCLIC SURTI BUFFALOS, DURING SUPEROVULATION AND AFTER EMBRYO RECOVERY

An investigation was undertaken to determine the interval from PGF2-al pha treatment to oestrus in 3 categories of Surti buffaloes, viz. norm al cyclic cows (recipients), during superovulation (donors) and after embryo recovery (flushing). Single i. m. injection of either 25 mg (n= 13) or 35 mg (n=10) PGF2-alpha synchronized the oestrous cycles of 65. 22% buffaloes within 88.00+/-7.99 hr of treatment. Oestrus was induced earlier (P<0.01) during superovulation (41.71+/-3.27 hr, n=21) as com pared to normal cyclic buffaloes(88.00+/-7.99hr,n=15) and after embryo recovery (23.39+/-3.99 days,n=18).There results further indicated tha t type or brand of gonadotropin used for superovulation or prostagland in treatment on day of embryo recovery (day 5.5 to day 7.5) or number of corpora lutea (1 CL or > 2 CL) had little influence on return-to-oe strus interval after embryo recovery in Surti buffaloes.