Reproductive Physiology in Livestock
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Abstract
Abstract
Small size of follicle, which may be due to summer, and high progesterone (P4) could hamper the ovulatory response to gonadotropin-releasing hormone (GnRH) at the beginning of GnRH-based protocols for estrus synchronization (GnRH-1), thus decreasing fertility. Accordingly, the objective of this study was to evaluate the effects of two-day extension in interval between presynchronization (Ovsynch) and breeding (Heatsynch) protocols and administration of prostaglandin F2α (PGF 2α ) two days before breeding protocol on size of the largest follicle (LF) and P4 concentration (PC) at GnRH-1, respectively, and fertility of cows during summer. Cows were randomly assigned to four experimental groups, including: 1) O7DH (cows with 7-day interval between Ovsynch and Heatsynch; n = 153), 2) O7DH+PG (cows with 7-day interval between Ovsynch and Heatsynch plus administration of PGF 2α two days before Heatsynch; n = 156), 3) O9DH (cows with 9-day interval between Ovsynch and Heatsynch; n = 147), and 4) O9DH+PG (cows with 9-day interval between Ovsynch and Heatsynch plus administration of PGF 2α two days before Heatsynch; n = 154). Further, cows were subjected to ultrasonographic examination and blood sampling at GnRH-1. Extension of the interval between Ovsynch and Heatsynch did not affect size of LF at GnRH-1 (P > 0.05); however, it decreased pregnancy risk (P 0.05). In conclusion, the present study revealed that additional two days before breeding protocol did not increase follicle size at GnRH-1 and reduced fertility. Furthermore, PGF 2α administration before breeding protocol could not improve fertility of cows despite reducing PC at GnRH-1.
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@article{Baghbanani2026Effects,
title = {Effects of extending interval between presynchronization and breeding protocols and prostaglandin F2α administration before breeding protocol on reproductive performance of Holstein dairy cows during summer},
author = {Reza Hemmati Baghbanani and Emadeddin Mobedi and Amir Abbas Mohieddini and Poorya Pooladzadeh and Shayan Zarabadipour and Mehdi Vojgani and Faramarz Gharagozlou and Vahid Akbarinejad},
journal = {Veterinary and Animal Science},
year = {2026},
doi = {10.1016/j.vas.2026.100780},
url = {https://doi.org/10.1016/j.vas.2026.100780}
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