I had a Heat Wave bull calf a week ago. He was up and nursing within 45 minutes, everything looked good. The next day he seemed to be laying around more and I never saw him nurse or move much after he was about 36 hours old. Heart rate and lungs sound great, but he does not want to walk without pushing him. He can get up on his own, but just seems unstable. I am bottle feeding him now, does not nurse for long when cow is around. Any ideas? Mineral deficiency?