Is bloody stool in cows a sign of milk fever?

No, milk fever is a calcium deficiency. This usually occurs in dairy cattle that have just calved, the animal is putting all the calcium from her body into the milk. Signs of milk fever is the inability to stand, off feed, low energy levels.

Whereas bloody stool can be a result of bowel diseases, bowel irritation, or diarrhea. It is best to consult with your veterinarian before beginning treatment.