Comparison the pregnancy rates in different synchronization and ovulation protocols in Khuzestan buffalo

This study was evaluated the pregnancy rates of fixed time artificial insemination after synchronization of follicular wave Ovsynch CIDR and Co-synch CIDR protocols compared with artificial insemination after estrus detection in select synch protocol.
In this study, 42 cyclic buffaloes, uncertain stage of the estrous cycle, were randomly assigned into 3 groups. 1) Ovsynch CIDR (n = 14), administration of GnRH at days 0 and 9, PGF2α at day 7 and insertion CIDR from days 0 to 7. Buffaloes of this group were inseminated 16 h after the second GnRH administration. 2) Co-synch CIDR (n = 14), insertion the CIDR and administration of GnRH at day 0, administration the PGF2a at day 7 with remove the CIDR, and day 9 with second administration of GnRH, artificial insemination was performed.3) Select synch CIDR (n = 14), hormone treatments of this group were similar to two other groups. But, there was not the second injection of GnRH and artificial insemination was performed after estrus detection during 3 days.
The pregnancy rates of Ovsynch CIDR (28.57± 12.53%), Co-synch CIDR (50 ±13.87%) and Select synch CIDR (28.57 ±12.53%) had not significantly difference.
In summary, it can be concluded that Co-synch CIDR protocol due to non-significantly higher pregnancy rate is more effective method, when compared with other protocols. and non-necessary to estrus detection as well as low labor.