Cows eat everything from grass and dirt which include nails and wires. Cows do not use lip to distinguish between different material and do not completely chew before swallowing. The dirt objects tend to lodge in the honeycombed walls of the reticulum, thus directly threatening the surrounding vital organs and causing irritation, inflammation and even worse which knew as hardware disease. Hardware disease will lead to cows to lose appetite, decrease milk output or the ability to gain weight. Cow magnets are a veterinary medical device which utilized in treatment and prevention of hardware disease. Farmers and veterinarians use cow magnets to fight hardware disease by attracting ferromagnetic matters from rumen and reticulum. Cow magnets are inserted into the cow’s mouth by farmers or veterinarians, then lodge in cow’s second stomach and attract stray metal on its way by. Finally holding it in a safe place.
