It sounds like the intial problem started with a leg back, I have been calving cows for a long time on my own and i'm only 34, the leg back calving problem can be an easy fix, no need for a vet. 9 times out of 10 the front leg is just hooked on the pelvis reach in and pull it out calf will live...
I have a question, Would you rather use lick tubes or keep caking the cows before calving even with the same amount of protein in the tubes and cake ??????
Thanks