I posted something earlier about our buckling not being able to stand after his birth this morning. His two siblings were up and walking around for the first couple of hours and now they are walking on their front elbows. When I try to stretch their front legs out to straighten them, the joints around their feet won't straighten. It's like they are curled under and I can't get them to move. I gave them selenium/e gel about two hours ago and they haven't gotten any better. What is wrong with them and what else can I do?