I know it can be done, I heard of retaining as many as 5 embryos. You just need to find a lawyer experienced in equine affairs that would know how to write that up for you.
Posts: 10368 Location: At the race track with Ah Dee Ohs
It can be done, I have a friend who sold a very nice broodie to the Brazilians and she retained an embyro or two for couple years. Best bet is to call AQHA and ask for their assistance.