An Investigation of Poor Embryo Transfer Results in an Angus Herd
A herd investigation into poor embryo transfer pregnancy rates was conducted on a 120 cow Angus operation in the summer of 2014. On this farm, the investigation included a water quality assessment, testing for nutritional imbalances including protein and mineral balance, and an investigation into pregnancy rates based on fresh versus frozen embryos and sorted by the donor, quality code, and embryo stage. Eight of seventeen recipients were pregnant out of the first set of transfers (47% pregnancy rate) and five out of sixteen of the recipients in the second group were pregnant (31 % pregnancy rate), for a pregnancy rate for the breeding season of39%. There was also a poor return to estrus noted with only one cow from each group showing signs of estrus on the first cycle after transfer. The decreased pregnancy rate resulted in immense economic loss for the farm, with delayed calvings, lost genetic potential, and expenses incurred from superovulation and embryo transfer.