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Journal of Animal and Veterinary Advances
Year: 2020  |  Volume: 19  |  Issue: 6  |  Page No.: 82 - 91

Development of Fixed-Time Artificial Insemination Through Luteinizing Hormone Peak, Plasma Progesterone and Follicular Dynamics in Locally Adopted Bos indicus Cow of Azad Jammu and Kashmir

Beenish Shahid, Muhammad Ijaz Khan, Syed Murtaza Hassan Andrabi, Muhammad Nasim Khan, Shafiq Haider, Mujahid Hussain, Muhammad Shahzad and Abdul Razzaq    

Abstract: The experiments were conducted aiming to evaluate the effect of three estrus synchronization protocols viz. Ovsynch, CIDR and CO-Synch+CIDR on LH Peak, Plasma P4 and follicular dynamics in a fixedtime AI (FTAI) in locally adopted non-descript indigenous cows. The blood samples were collected at 2 h intervals, starting at 12-108 h from post PGF2α to determine the LH surge and for P4 on day 0, 4, 7, 11 and then once weekly for 8 weeks of estrus synchronization and FTAI. A better synchrononyof LH peak was observed in Ovsynch group (48.40±0.40 h post PGF) compared to CIDR (71.67±9.74 h) and CO-Synch+CIDR (54.86±4.71 h) protocols. The mean follicular diameter, daily growth rate and ovulation rate did not differ (p>0.05) among three groups. The interval between PGF and ovulation was lower (p>0.05) in Ovsynch group when compared to CIDR and CO-Synch+CIDR groups. The conception rate at first service (80%) in Ovsynch group was significantly higher (p<0.05) compared to CIDR and CO-Synch+CIDR groups. It is concluded that the time of LH peak in synchronized estrus of non-descript indigenous cows is simsilar to taht in Bos Tauruscows and Ovsynch protocol induced the best synchrony of pre-ovulatory LH surge and ovulation.

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