Causes of Bovine Diarrhea

All dairy and meat cattle should have firm, round stool. Having frequent, watery stool is a sign of poor health. Diarrhea (or scours) can cause loss of weight in meat cattle and problems in milk production in dairy cattle. If the diarrhea persists, then the cow risks dying of dehydration. Any time a cow has diarrhea for more than a day, a vet should be called.

  1. Bovine Viral Diarrhea

    • There are six types of bovine viral diarrhea (BVD), but all are contagious. The usual symptoms are fever, yellow pus from the nose and eyes, and diarrhea that may have blood and mucus in it (see Resources).

    Winter Dysentery

    • This usually happens to dairy breeds more than meat-producing breeds in the winter for reasons not entirely understood. Symptoms include explosive diarrhea, loss of appetite and listlessness.

    Salmonella

    • This is the same infection that can happen to many mammals from spoiled food. Salmonella happens more to cattle in feed lots or cattle sharing small spaces (see Resources).

    Salt Poisoning

    • This happens when a cow does not get enough water, which more often happens in winter. Early symptoms include diarrhea, vomiting, drooling and problems with coordination.

    Changes in Diet

    • Any changes in the cow's feed need to be done slowly and gradually, or else the cow will get diarrhea.