The reason to use a foster mare instead of bottle feeding is that a mare can raise a future racehorse better than a human from the psychological perspective. The mare and foal need to be out with other mares and foals. Putting an orphan out with mares with foals will likely get him kicked or bit with no 'mom' to run to for protection. For maximum growth, they want the TB foal to have ALL the milk. With a family cob, bottlefeeding and raising in a more confined area are less damaging to the future family horse. It is also possible that other nursemares may have the 'left behind' foal grafted on so they raise 2, not one. And the humans supplement feed, of course. If no nursemares are needed that year, then they raise, train and sell the cob foals without removing them from their dams. Are ALL nursemare providers like this? I don't know, but if I had a dead mare and a newly orphaned foal, I would be looking for a healthy well cared for mare to 'mother' it. The plight of the foals separated from their dams, loaded up and shipped off to rescue without colostrum or any sort of supportive care or thought is real. It doesn't seem like a smart business move, nor the move of a horseman. Or of a nursemare provider. Where the foals come from is undisclosed; unlike how Coolmore Ireland clearly shows where their nursemares originate and their foals and what happens to them. You have to believe there may be a reason for that; and that you may not be dealing with nursemare industry foals at all.