The Effects of Algae on Cattle

Algae is the green residue that grows in drinking troughs and ponds. Blue-green algae is toxic to cattle as well as human beings and other animals. Not all algae is toxic, but that which is kills in a few hours by depressing the animal's central nervous system, causing respiratory and liver failure. Manure contamination is a common source of algae growth in drinking water. There are ways to protect your animals from algae.

  1. Symptoms

    • Call your vet immediately.

      Symptoms of blue-green algae poisoning are decreased coordination, diarrhea, difficulty breathing and death. Call your veterinarian for assistance. While there is no antidote, medical-grade charcoal and mineral oil may be suggested to prevent more absorption of the toxins. Some skin may peel off during recovery.

    Prevention

    • Prevention is the cure.

      Prevent water from becoming contaminated by building an elevated shelf for cows to put their forefeet on before they can access the water. This will prevent manure from dropping in the trough as they drink. Cracks in cisterns and rodent droppings can also contaminate water. Try to use fresh rather than pond water for your animals.

    Clean the Tanks

    • Keep the environment clean.

      Clean troughs and disinfect with diluted bleach regularly before allowing animals to drink. Sprinkling baking soda in the water occasionally may help reduce the growth of algae. Have the water tested periodically by a lab for contaminants.

    Eliminating Algae

    • Fresh water is best.

      Treat water in tanks or ponds with copper sulfate or bluestone to kill algae when there is a large overgrowth or animals have become ill. Use 1 tsp. per 1,500 gallons of water or one ounce for 8,000 gallons of water. Don't allow animals to drink the water for at least 24 hours after treatment.