Well, if you’re going to go through the expense and higher risk of ET then you need to set yourself up for the best odds of success.
You need a vet who not only specializes with reproduction, but who has a lot of experience and good success rate with ET.
If you want to maintain your own recipient herd, you SHOULD try to synchronize at least 2 but preferrably 3 receipients along with your donor. Three is better and increases your odds. Mares quite often are not interested in reading up on the current literature and much rather do their own thing. I would rather spend $180 on extra hormones on an extra mare than lose an entire cycle because nobody synchronized right.
If you use an ET vet, your best ones are those that do also maintain a herd because they’re committed to doing the procedure big time - they’re paying for these mares to sit in their field waiting to be a recipient for the customer.
Your receipient mares need to be young, healthy, have very good uteruses free of infection with a good biopsy score. They preferrably have had at least 1 foal so that (a) you know they’re able to get pregnant and (b) that they’re going to be decent moms. The recipient mares should have the kind of temperament you demand from your donor - because SHE’s influencing her donated baby. She should be easy to handle and not a basket-case nutjob.
For me in Alberta, it costs me about $1800 for the first cycle and that is me performing the P&E myself and supplying my own herd. My vet is a gentle guy, but he’s pretty firm that it’s better odds with 2-3 receipient mares provided and I tend to believe him.
If I were to use one of my vet’s mares, it’s $3000 for the first cycle and that includes the mare who then comes home to live with me.
Plus stallion fee + shipping fees for semen.
If I’m just pulling embryos for the purpose of freezing, then it is less money and we’ve done this - haven’t thawed any out yet though. Embryos are most successfully frozen with fewer complications if you manage to flush them as early as possible - 5.5 to 6 days and they need to be vitrified in ethylene glycol-glycerol solution before being put into the LN2. The mare needs to be at the vet’s and he commits himself to watching her pretty darn closely so he knows exactly when she’s ovulated, not only to get her insemination timed right, but also so that he can calculate the time he needs to start getting in there and flushing her.
Timing is everything. Skill and practice are everything.
I do not believe a vet who claims a 100% success rate. Not possible. He should, however, be able to flush a viable embryo from your donor mare 50-75% of the time. Then it’s up to your receipient mare’s fertility to help encourage the odds of a successful transplant.