2. I learned a hard lesson the hard way when I didn't separate a heifer allowing another's calf to nurse before calving.
She refused her own calf... actually Killed It when it tried to nurse! And then stole the nursing calf from the other cow.
She was so in Love with that calf she wouldn't let you or any cow near it. HEIFERS B Crazy
No problems with subsequent calvings, but she was nuts over that one.
So by now you know how important it is . I would also suggest giving this heifers calf colostrum replacer (not supplement), depending on how much/often she let the other calf nurse because when it's gone, it's gone.