Replacement of the first GnRH by estradiol in the breeding Ovsynch of Double Ovsynch protocol could improve fertility in Holstein dairy cows

Allahyari, Iman; Gharagozlou, Faramarz; Vojgani, M.; Pooladzadeh, Poorya; Mobedi, Emadeddin; Akbarinejad, Vahid

doi:10.1016/j.anireprosci.2023.107228

Cited by 2 publications

(2 citation statements)

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“…The mean of CL diameters reported in the present study was similar to those previously reported in buffalo (Baruselli et al, 1997;Yindee et al, 2011). The results of this study revealed no significant differences in luteal diameters between groups contradicting the results reported in a previous study on Nili-Ravi buffalo (Waqas et al, 2016).…”

Section: Discussionsupporting

confidence: 92%

“…The synchronization rate was defined as the percentage of cows that responded to both PGF 2α by regression of a functional CL and the final GnRH of the protocol by ovulation (Pursley et al, 1995). Pregnancy per AI (P/AI) was estimated by dividing the number of pregnant cows by the number of cows subjected to TAI, which was multiplied by 100 (Allahyari et al, 2023).…”

Section: Experimental Designmentioning

confidence: 99%

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The Fertility Outcomes of Egyptian Buffalo Cows after Ovsynch and Presynch-Ovsynch Protocols

Othman,

Elshalofy,

Abou-Ahmed

et al. 2023

Journal of Applied Veterinary Sciences

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The present study aimed to compare the reproductive outcomes after the blind application of the standard Ovsynch and Presynch Ovsynch protocols on Egyptian Buffaloes (Bubalus bubalis) during the breeding season. Fifty multiparous Egyptian buffalo cows of an unknown stage of the estrous cycle were randomly divided into two groups: 1) the standard Ovsynch protocol (first GnRH (G1) at d0, PGF 2α at d7 , and second GnRH; G2 56 h later and 2) the pre-synch Ovsynch (G6G-Ovsynch) protocol (PGF 2α and GnRH 2 days apart 6 days before starting G1 of the standard Ovsynch). Cows were subjected to timed artificial insemination (TAI) 16 and 40 h after the G2 injection in both groups. Blood sampling and ovarian transrectal ultrasonography were performed at three time points, PGF2α, G2, and 2 days after G2. Serum progesterone (P 4 ) (ng/mL) concentrations were significantly higher in the G6G-Ovsynch group than in the Ovsynch group at the time of PGF 2α and two days after the G2 injection, but they were lower (P ˂ 0.05) at the G2 injection. The Vascularity index of the corpus luteum (CL) and dominant follicle (DF) wall area (%) were higher (P ˂ 0.05) in the G6G-Ovsynch group compared to the Ovsynch group. The ovulatory response indicated by the presence of CL at d7 was significantly higher in G6G-Ovsynch than in Ovsynch (73 vs. 51%, respectively). Moreover, a higher (P ˂ 0.05) pregnancy rate was observed in G6G-Ovsynch than in the Ovsynch group. In conclusion, the blind application of the G6G-Ovsynch improved the ovulatory response in the early stages of the synchronization protocol and raised the pregnancy rates in Egyptian buffaloes. .

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Section: Discussionsupporting

confidence: 92%

Section: Experimental Designmentioning

confidence: 99%