Yes. Most cow magnets can weigh around a pound or two each, but often never exceed three.
They don't. The magnet stays in the cow for the rest of her life.
It doesn't. The magnet stays in the reticulum for the whole entire life of the animal.
Yes
The exact same way that a normal magnet attracts metal.
Cows don't have "built in magnets." Magnets are inserted down the throat of a cow as a way to prevent her from getting hardware disease from eating too much scrap metal like nails and wire. The magnet in a cow works exactly the same as any "normal" magnet does.
It can be done with cotton or string if the magnet is not too heavy.
the average beef cow is 1,333lbs
You can't. It doesn't matter which end of a cow magnet is North or South. As long as it can pick up metal and the metal sticks to it, then it works just fine.
Get a veterinarian out as soon as possible. No cow magnet is going to prevent glass from puncturing the animal's insides.
cow
iron
A mature Holstein cow typically weighs about 1,500 pounds. So, 1800 pounds is around one-and-one-fifth times as heavy as Holstein cow.