Artificial insemination has been utilized in dairy cattle for decades, but the adoption of this technique has been low in the beef industry. Ovarian synchronization protocols that allow for timed artificial insemination are attractive because estrus detection is not required, becoming a very useful tool to improve the overall reproductive efficiency of commercial herds. Producers should seek advice from a specialist, who can recommend the most appropriate protocols for each category of animal and for each herd, taking into account that the results obtained in heifers have been more variable than in adult cows. In this publication, we review the ovarian synchronization protocols based on gonadotrophin releasing hormone (GnRH) and prostaglandin F2α (PGF) for dairy and beef heifers, as well as several modifications that have been proposed, to enhance pregnancy rates.

Sanz A, Macmillan K, Colazo MG (2019). Revisión de los programas de sincronización ovárica basados en el uso de hormona liberadora de gonadotropinas y prostaglandina F2α para novillas de leche y de carne. ITEA‑Información Técnica Económica Agraria 115(4): 326‑341. https://doi.org/10.12706/itea.2019.002