A new method for bovine embryo production: a potential alternative to superovulation

Area of Science:

• Veterinary Science
• Reproductive Biology
• Embryo Production

Background:

• Conventional superovulation for in vitro embryo production involves hormonal treatments and surgical procedures.
• There is a need for less invasive and repeatable methods for oocyte collection in cattle.

Purpose of the Study:

• To evaluate the feasibility of transvaginal ultrasound-guided follicle puncture for collecting immature oocytes in cows.
• To assess the efficiency of this method for in vitro production of bovine embryos.

Main Methods:

• Eight cows underwent repeated transvaginal ultrasound-guided follicle punctures at weekly intervals.
• Collected immature oocytes were matured and fertilized in vitro.
• Resulting embryos were transferred to surrogate sheep oviducts for a six-day development period.
• Embryos were recovered via oviduct flushing.

Main Results:

• A total of 104 oocytes were collected across six trials.
• 75 oocytes/embryos were recovered from sheep oviducts.
• 24% of recovered oocytes/embryos developed into viable morulae and/or blastocysts.
• The procedure demonstrated successful non-surgical, repeated collection of immature oocytes.

Conclusions:

• Transvaginal ultrasound-guided follicle puncture is a feasible and effective method for collecting immature oocytes in cows.
• This technique can be successfully applied for in vitro production of bovine embryos.
• The embryo yields may be comparable to conventional superovulation procedures, offering a potentially advantageous alternative.