Living here in the western U.S. in ranching country I can attest that all large animals that we deal with on a daily basis can require human assistance even before the birth event. We deal, especailly with older mother cows, with porlapse. The remedy for this to see the pregnancy through to a live birth can seem somewhat brutal, yet it saves both the mother and calf. We can repair vaginal prolapse, but uterine prolapse requires we call the veternarian.
Each year we introduce new heifers to the herd to refresh the DNA pool as well as replace the older cows with new blood. I dislike the onset of March when we have large numbers of heifers having thier first calf. It's lots of work and it seems they always know when it's 3:00 AM to have their most difficult problems...
My sheep raising neigbors don;t have it any better. A new neighbor sown the road 5 miles is raising llamas... guess what? He reports the same kind of problems on occasion...