One particular cow ("Evjelin" IIRC) would try to avoid her own calves because (it seemed) she much preferred the machine it seemed.
The final year we found her calf with a broken neck in a flat area of the pasture. (Yes, they were always allowed to stay outdoors around when they calved and usually they spent a few days outside together. Mostly this was great I think and except this incident I only remember one other were it was a problem: one calf had got under the fence and into the bog and the cow had followed it into the bog and it was a real mess and I was a really proud teenager when I was able to get out the calf. Both of them needed help to get out but both survived and recovered nicely IIRC.)
(source: grew up on a tiny dairy farm)