Transvaginal Ultrasound-guided Ovum Pick-up(OPU) in Cattle

OPU together with IVF has been taken as another challenge to the animal reproduction. While under so many years development, OPU has been considered as a mature technology. No many breakthroughs might happen to this technology. We concluded the history, present of bovine OPU, its advantages and disadvantages, factors that may influence its efficiency in this article. We hope to offer a reference for the development of bovine OPU technology in the future.