E-ISSN 2536-9520 | ISSN 1110-2047
 

Original Research (Original Article) 


Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows

Emad M. Abd El-Razek, Tamer M. Genedy, Ahmed H. Zaghloul.

Abstract
Presynchronization strategies, such as Presynch- Ovsynch and Double- Ovsynch, increase fertility to timed artificial insemination (TAI) compared with Ovsynch alone; however, simpler presynchronization strategies could reduce costs and simplify reproductive management. Our objective in this study the effect of parity and average milk production on the conception rate after resynchronization with G6G protocol or Ovsynch protocol. Lactating Holstein cows (n = 100) divided into two groups (Ovsynch and G6G) cows in this group1 (n = 50) were received the following treatment sequence, 12 µg Buserelin on day zero, 500 µg IM of Cloprostenol on day seven, 12 µg Buserelin IM on day nine and received timed artificial insemination (TAI) 16 hours later. Group II (G6G): were received 500 µg IM Cloprostenol on day zero, 12 µg Buserelin on day two and six days later these cows received the Ovsynch as previously explained in the first group. Conception rate was (40 vs. 30 %) for G6G and Ovsynch protocol respectively primiparous cows, conception rate to G6G program was 46.15%, compared to 28.57% in cows synchronized with Ovsynch program. In Multiparous cows, the similar trend was observed but the difference was smaller (conception rate 37.8 vs. 30.55% in cows synchronized with G6G and with Ovsynch, respectively). In high producers, conception rate was numerically higher in the Ovsynch group (40%) compared to the G6G group (36%). While, in low producers, conception rate to G6G protocol (48%) tended (P = 0.07) to be higher than that to Ovsynch protocol (20%) in conclusion Administration of PGF2α 8 d before initiation of Ovsynch did not improve conception rate compared with the standard Ovsynch protocol

Key words: G6G, Ovsynch, presynchronization, fertility, dairy cow.


 
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Pubmed Style

El-Razek EMA, Genedy TM, Zaghloul AH. Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. AJVS. 2018; 57(1): 46-51. doi:10.5455/ajvs.246155


Web Style

El-Razek EMA, Genedy TM, Zaghloul AH. Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. http://www.alexjvs.com/?mno=246155 [Access: September 19, 2018]. doi:10.5455/ajvs.246155


AMA (American Medical Association) Style

El-Razek EMA, Genedy TM, Zaghloul AH. Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. AJVS. 2018; 57(1): 46-51. doi:10.5455/ajvs.246155



Vancouver/ICMJE Style

El-Razek EMA, Genedy TM, Zaghloul AH. Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. AJVS. (2018), [cited September 19, 2018]; 57(1): 46-51. doi:10.5455/ajvs.246155



Harvard Style

El-Razek, E. M. A., Genedy, T. M. & Zaghloul, A. H. (2018) Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. AJVS, 57 (1), 46-51. doi:10.5455/ajvs.246155



Turabian Style

El-Razek, Emad M. Abd, Tamer M. Genedy, and Ahmed H. Zaghloul. 2018. Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. Alexandria Journal of Veterinary Sciences, 57 (1), 46-51. doi:10.5455/ajvs.246155



Chicago Style

El-Razek, Emad M. Abd, Tamer M. Genedy, and Ahmed H. Zaghloul. "Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows." Alexandria Journal of Veterinary Sciences 57 (2018), 46-51. doi:10.5455/ajvs.246155



MLA (The Modern Language Association) Style

El-Razek, Emad M. Abd, Tamer M. Genedy, and Ahmed H. Zaghloul. "Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows." Alexandria Journal of Veterinary Sciences 57.1 (2018), 46-51. Print. doi:10.5455/ajvs.246155



APA (American Psychological Association) Style

El-Razek, E. M. A., Genedy, T. M. & Zaghloul, A. H. (2018) Effect of Parity and Milk Production on Conception Rate After Two Synchronization Protocols in Dairy Cows. Alexandria Journal of Veterinary Sciences, 57 (1), 46-51. doi:10.5455/ajvs.246155





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