Evidence-based ET
John F. Hasler
Note: I have been using subjects suggested by our board of directors for this column for the past two years. I would be happy to attempt covering any subjects that the membership might suggest. Let me hear from you!
What is the best synchrony between IVP embryos and recipients?
There is a great deal of evidence that synchrony between the age of in vivo-derived embryos and the day of the estrous cycle in recipients at the time of transfer is affected very little, if at all, when synchrony is within the three day period of 0, plus one or minus one day (zero, meaning day of estrus and age of embryo are the same). Consequently, the pregnancy rate is not affected when day 7 embryos are transferred into day 6, 7, or 8 recipients. This holds true for both fresh and frozen in vivo-derived embryos (Hasler, 2001).
Not logged in