Oh darlin', have you got your work cut out for you! Glad to hear that you are separating them ASAP, hopefully, momma isn't already pregnant (not your fault and I'm not even thinking that way). There is an extra reason for separating mother and son. If she only scores a 1 or 1.5, and he scores a 4.5, there is something seriously off here. He may be a feed hog and not letting her eat all she needs. When you throw your bale of hay out in the morning, you might want to make several piles of it, so that when the colt runs her off of one pile she can simply move to another pile. It's more work, but it will at least give mom a chance to get her fair share before baby snarfs it up.
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!