We have a very small group of cows. On Saturday morning we found that one of them (approx. 10y/o) had had her calf overnight. Both appeared well. Sunday morning we found the mother had died sometime during the night. We have no idea what could have happened to her. No indication of a prolapse or anything. Any ideas?? Now we have our first bottle fed calf. Any pointers? Also how/when does one attempt to introduce the calf to the herd? Thanks.