How are magnets used with cows?
Some cows have magnets inside their stomachs! The magnets attract any metal that the cow might accidently eat, which would harm or kill the cow if it passed through the digestive system. A cow can keep a magnet inside the stomach for it's entire life without harm.
They are used to prevent any metal objects from penetrating the reticuloruminal lining. If any sharp objects (like nails and wire) do penetrate the stomach wall, this will invite infection and cause the cow to get extremely ill. Magnets are only used for those cows that are fed feed that tends to have a lot of metal junk in it, or are grazed in pastures with lots of metal junk in it. For cows that…
Some migratory birds have some magnetic sense, now believed to respond to changes in field strength rather than N-S. Some farmers used to feed magnets to cows. They would stay inside the bottom of the cows stomachs. (they have 4 of them). If the cow ate a nail or barbed wire, it would be trapped and not pass through the rest of the cow digestive tract. eD