Embryo transfer in cattle: an evaluation of the current situation

Area of Science:

• Reproductive biology
• Veterinary science
• Embryology

Background:

• Superovulation protocols are crucial for maximizing oocyte yield in cattle.
• Efficient methods for ova recovery are essential for successful embryo transfer programs.
• Transcervical techniques offer a less invasive alternative for uterine flushing.

Purpose of the Study:

• To describe and evaluate a novel transcervical technique for ova recovery in cattle.
• To assess the efficacy of the developed apparatus and procedure for collecting ova.
• To determine the conception rates following embryo transfer using recovered ova.

Main Methods:

• A specialized catheter (metal catheter glued inside a 3-way Foley catheter) was employed for transcervical ova recovery.
• Superovulation was induced in 102 donor cows of various breeds and ages.
• Ova recovery involved transcervical flushing of the uterus post-slaughter.

Main Results:

• A total of 956 corpora lutea were observed in 102 donor cows (average 9.4 per cow).
• Transcervical flushing yielded 294 ova, representing a 30% recovery rate.
• A 40% conception rate was achieved in cows receiving transferred embryos.

Conclusions:

• The described transcervical technique is effective for ova recovery in cattle.
• The results support the potential for developing more efficient cattle breeding programs through inovulation.
• Further research and optimization of this technique could enhance its widespread application.