Comparative assisted reproductive technologies in human and veterinary medicine: implications for reproductive success.

Assisted reproductive technologies (ART) have been widely and successfully used in both humans and livestock. However, only in humans and cattle have in vitro fertilization (IVF), in vitro embryo culture (IVC), and embryo transfer (ET) developed into large commercial sectors. The major differences between human and animal ART include the rationale of the treatment and the patient groups. While ART is used to treat infertility in humans, veterinary ART aims to maximize genetic gain and minimize generation intervals. Human ART is filled with societal, cultural, and emotional challenges, whereas veterinary ART aims to optimize economic success. While human ART deals with selected patients, including older individuals, veterinary ART focuses on young animals and a wide variety of species with different reproductive traits. Both human and veterinary ART face the shared challenge of establishing reliable tools to assess sperm fertilizing ability, evaluate oocyte developmental capacity, and support early embryo-maternal communication, which is pivotal for successful pregnancy. A holistic approach and comprehensive understanding of the underlying mechanisms and technologies across species could provide valuable insights for increasing ART success rates in both humans and animals.