Embryo Transfer

Marianna Jahnke, Associate Teaching Professor, received her Master's degree in Animal Physiology (with a specialization in reproductive physiology) at Iowa State University. Her expertise is in the area of embryo biopsing, embryo sex determination, and embryo splitting. She is also involved with all aspects of the embryo collection, transfer, and cryopreservation process.

Tyler Dohlman, Associate Professor, received his DVM at Iowa State University in 2010. After a few years in private practice, he came back to Iowa State and completed a Theriogenology residency and his Master's degree in Reproductive Physiology in 2015. Dr. Dohlman is a certified member of the American Embryo Transfer Association (AETA) and is a Diplomate of the American College of Theriogenologists (DACT). He is active and involved in many applications of assisted reproductive technologies including embryo transfer and ultrasounding in many species. 

The Embryo Transfer Service offers clients one of two main options for the production, collection, and transfer of embryos from their genetically superior females. Clients can administer superovulation treatments on their farm and then bring their inseminated donor cow(s) to Iowa State University for the embryo recovery process. Alternatively, donor cows can be housed at Iowa State University for all superovulation treatments and artificial inseminations. After embryos are recovered from the donor cow(s), they can be transferred fresh to synchronized recipient females or they can be frozen for transfer to recipients at a future date.

A variety of other reproductive services is offered through the Embryo Transfer Service, including embryo biopsy for sex determination and embryo splitting for the production of identical twins. Other services provided are ultrasonography, dominant follicle ablation, hormone assay and embryo exporting and fetal sexing.

Embryo biopsy technique
Embryo biopsy technique
Embryo biopsy technique
Embryo biopsy technique
Janke holding calf that resulted from biopsied embryo
Calf resulted from a biopsied embryo


The following services are available for a fee

  • Embryo Recovery
  • Superovulation Hormones
  • Synchronization Products (e.g., Lutalyse, CIDR)
  • Transfer of Frozen/Thawed Embryo
  • Transfer of Fresh Embryos
  • Biopsy and Embryonic Sex Determination
  • Embryo Splitting to Create Identical Twins
  • Donor Housing
  • Recipient Housing
  • Ultrasound Procedures
  • Fetal Sexing
  • Embryo Exporting
  • Dominant Follicle Ablation

Short Courses

Bovine Embryo Transfer Training and Refinement

Registration Form



Marianna Jahnke, MS

Marianna Jahnke, MS
Food Supply Veterinary Medicine
2201 Lloyd Veterinary Medicine
Iowa State University
Ames, IA  50011


Tyler Dohlman, DVM, DACT, MS
Food Supply Veterinary Medicine
2201 Lloyd Veterinary Medicine
Iowa State University
Ames, IA 50011