Articles | Volume 62, issue 1
Arch. Anim. Breed., 62, 161–170, 2019
Arch. Anim. Breed., 62, 161–170, 2019

Original study 10 Apr 2019

Original study | 10 Apr 2019

Effect of two prostaglandin injections on days 5 and 6 in a timed AI protocol after estrus expression on pregnancy outcomes in dairy cows during cold or hot seasons of the year

Mufeed A. Alnimer et al.

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Subject: Livestock physiology | Animal: Cattle
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Cited articles

Alnimer, M. A. and Ababneh, M. M.: Effect of estrus expression prior to ovulation synchronization protocols on reproductive efficiency of lactating dairy cow, Livest. Sci., 163, 172–180,, 2014. 
Alnimer, M., De Rosa, G., Grasso, F., Napolitano, F., and Bordi, A.: Effect of climate on the response to three oestrous synchronisation techniques in lactating dairy cows, Anim. Reprod. Sci., 71, 157–168, 2002. 
Alnimer, M. A., Tabbaa, M. J., Ababneh, M. M., and Lubbadeh, W. F.: Applying variations of the Ovsynch protocol at the middle of the estrus cycle on reproductive performance of lactating dairy cows during summer and winter, Theriogenology, 72, 731–740,, 2009. 
Alnimer, M., Alfataftah, A. A., and Ababneh, M. M.: A comparison of fertility with a Cosynch protocol versus a modified Ovsynch protocol which included estradiol in lactating dairy cows during the summer season in Jordan, Animal Reproduct., 32–39, 2011. 
Astiz, S. and Fargas, O.: Pregnancy per AI differences between primiparous and multiparous high-yield dairy cows after using Double Ovsynch or G6G synchronization protocols, Theriogenology, 79, 1065–1070,, 2013. 
Short summary
We tested whether prostragladin (PG) injection on day 30 pp and detection of estrus can affect the efficacy of injection on days 5 and 6 in the TAI protocol compared to the Cosynch protocol. The proportion of cows in estrus on the day of TAI was higher than those that received two PGs than those cows that received one PG. Treatments with PG on days 5 and 6 after the first GnRH injection increased P/AI.