Actually, I'd never seen one before, but knew of them. They sit in the bottom of the first stomach and hold any ingested iron there until it rusts to nothing, protecting the rest of the cow's digestive tract.
It's also just to keep the metal in place long enough for the cow to reach the age of slaughter. A few cents(then) to protect a food investment. They aren't pets. Hence where this was posted.
The trick intrigued me when I first heard about it as a kid. We had friends with a small farm and a couple beef critters. Thanks for posting, now I've seen one!
You're welcome mate. I can't but maybe can give you a cowpill badge for getting it right. :)
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