I'll have fun researching the pedigrees and looking at the pretty pictures!!
Have you posted any pictures of the new baby? If so, where/what date are they posted and I'll find them.
I was just reading an article about "nurse mares" and their abandoned foals. Bearing in mind that I've never raised a foal from the get-go, I would think that supplementing the TB foal's calorie intake with bottle feeding of say, goat's milk, would be easier than using a nurse mare.
(I'm not referring to a situation where the foaling TB mare is totally unable to nurse or has died, but just doesn't produce enough milk for a robust strapping Thoroughbred foal.)