Doppler ultrasonography is a technique which allows the study of blood flow to different organs and structures in a non‑invasive way. Therefore, in cattle reproduction, it has been of great help in identifying the hemodynamic changes that occur in the genital tract throughout the oestrous cycle, pregnancy, and post-partum. Taking this information into account, several applications of this tool were investigated at field conditions to optimise the efficiency of the farms.
In this way, among its applications it can be found the possibility of predicting the time of ovulation and estimating fertility; moreover, it allows the evaluation of the corpus luteum functionality, so that not only is it useful to establish heat inducement/synchronization protocols, but it may be also possible to perform an earlier "non‑pregnancy" diagnosis. Additionally, its effectiveness in predicting the outcome of superovulation protocols and the number of collected embryos has been studied. Finally, this technique might be of interest to detect post‑partum uterine diseases as soon as possible and identify the types of ovarian cysts.
Nevertheless, we cannot forget that, nowadays, Doppler ultrasonography has not proven to be accurate enough to conduct some procedures individually (such as performing an earlier pregnancy diagnosis or evaluate fertility), although it has offered interesting results to continue the research in this field.

Yáñez U, Becerra JJ, Herradón PG, Peña AI, Quintela LA (2022). Ecografía Doppler y su aplicación en reproducción bovina: revisión. ITEA‑Información Técnica Económica Agraria 118(1): 82-100. https://doi.org/10.12706/itea.2021.019