Efficacy of Different Synchronization Protocols on Generation of Fertile Estrus, Hormonal Profile, and Conception Rate in Bos indicus Achai Cows
Efficacy of Different Synchronization Protocols on Generation of Fertile Estrus, Hormonal Profile, and Conception Rate in Bos indicus Achai Cows
Shah Murad Khan1, Hamayun Khan1, Younas Muhammad1, Haq Aman Ullah1*, Muhammad Tariq Tunio2, Ali Gohar2 and Fazli Rabbani3
ABSTRACT
This study evaluated the efficiency of two different estrus synchronization protocols in Achai breed of cattle. Twelve lactating Achai cows were divided into two equal groups and subjected to Presynch Ovsynch (POP) or Modified 7-day Select Synch (MSS) protocol. In POP protocol animals were administered with PGF2-α injections on day -38, -24 and -3. GnRH-1 was given on day -10 and 0, along with timed artificial insemination after 16 hrs. Animals in MSS group were administered with a controlled internal drug release (CIDR) insert on day -7 with simultaneous use of prostaglandin 2-alpha (PGF2-α), GnRH-1 at day -5, removal of CIDR at day 0, concurrent with two doses of PGF2-α at 8 hr. interval, GnRH-2 on day 3, followed by TAI after 16 hrs. Results showed higher estrogen (E2) and lower progesterone (P4) concentrations for MSS than POP group. Cows with higher E2 and lower P4 levels at estrus got conceived (P<0.05). Highest level of E2 was recorded in pregnant cows in POP group in comparison with MSS. The P4 concentration of pregnant cows in MSS was lowest at the time of insemination (P<0.05). Induction of fertile estrous was maximum in POP group than MSS, but conception rate in cows receiving TAI was significantly higher in MSS than POP group (66.66% vs 33.33%;). Efficiency of MSS protocol was virtually double than POP for estrus synchronization and conception in Achai cattle.
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