We have had 2 abortions in the last year. One cow a 99 model lost her 2nd calf that we never found. This year she had one that was about the size of a 30 lb pig no hair. Another one aborted about 3 months ago in the early stages 2-3 months and she had been a consistant producer a 99 model. We haven't vacinated since calf hood. What would you suggest.