Is true of feeding an orphan foal?

You can use a goat to raise an orphan foal, at least partially. However, the goat may not produce enough milk as the foal grows and there is a difference in the amount of fat in the milk of goat and horse. Also, it gets tough for the foal to nurse from the tiny goat as it grows. You may prefer to milk out the goat and feed the foal by hand. I would suggest that you feed at least partially with a mare's milk supplement available from your feed store to make sure the foal gets the proper nutrition. Leave the goat in with the foal. Goats make lovely companions for horses and your foal needs a companion as much as milk.