I agree, colostrum is the biggie. Do you know if the foal was able to get any colostrum? As little as a quart will do to get the immune system going. We've had calves that got so weak from the birthing process they were not strong enough to suck. Worst case, we've had to rope a wild cow and tie up her leg so I could milk her for the colostrum.
On one hand your're so lucky to live on a remote island, but in this case, I'm sure you'll be wringing your hands until the replacer gets there. Do you have enough to get by? Good luck with the baby. Please keep us posted.
If the mare you mentioned has plenty of milk, you may have to milk her. You could milk your mare some to supplement the replacer, and stretch it until more arrives.
Last edited by 6W Ranch; 12-15-2012 at 10:14 PM.