I had a simple aortic valve replacement (Mosaic), without any aorta or root involvement, and not a Ross Procedure. That may have made my requirements different.
I asked if I should donate blood for myself before the surgery. My surgeon looked at me like I had lost my senses. He said, "What for? You won't need any blood." I wondered if there was a little pride in his statement, so I waited until later to ask his staff.
His people were also thrown off by the question, and assured me that they couldn't think of a time when one of their patients required blood during the operation. As he was doing over 1,000 heart operations a year, I guess they would know.
Best wishes,