Transcervical transfer of bovine embryos

Area of Science:

• Veterinary Science
• Animal Reproduction
• Embryology

Background:

• Superovulation is a common technique to increase oocyte yield in donor cows.
• Embryo transfer (ET) is a valuable tool in bovine artificial breeding programs.
• The efficiency of ET can be influenced by the transfer environment.

Purpose of the Study:

• To compare pregnancy rates following bovine embryo transfer under controlled laboratory versus field conditions.
• To evaluate the impact of transfer environment on the success of transcervical embryo transfer in cattle.

Main Methods:

• Embryos (6-9 days old) were collected from superovulated donor cows via surgical or non-surgical methods.
• Embryos were transcervically transferred to recipient cows using polyethylene tubes or plastic insemination pipettes.
• Pregnancy was assessed at 45 and 90 days post-transfer in both laboratory and paddock settings.

Main Results:

• Laboratory transfers resulted in pregnancy rates of 83.3% at 45 days and 66.7% at 90 days.
• Paddock transfers yielded pregnancy rates of 75% at 45 days and 41.7% at 90 days.
• No statistically significant difference in pregnancy rates was observed between laboratory and paddock transfers.

Conclusions:

• The transfer environment (laboratory vs. paddock) does not significantly affect pregnancy rates in transcervical bovine embryo transfer.
• Bovine embryo transfer is a viable reproductive technology with comparable success rates in controlled and field settings.
• Further research could explore other environmental factors influencing embryo transfer success.