Scanning cows reveals embryo transfer can have extreme variation in pregnancy rate
On two farm visits in Co. Limerick, I scanned the herds prior to the starting of an embryo transfer program. The herds had previously undergone U.S.A.R.T. prior to the program. In the first farm visited 8 out of 10 cows were confirmed pregnant, while on the second farm 1 out of 7 cows were confirmed pregnant. In the later situation the embryos were previously frozen to transfer. While in the 1st case the embryos had resulted in fresh transfers. The 7 embryos that were previously frozen were recovered from the 1 cow. In my opinion the poor pregnancy rate encountered was associated with embryos that failed to cryopreserve successfully.